Calm, prepared, and always in your corner.
William J. Duffy
Criminal Defense Attorney
William J. Duffy

Calm, prepared, and always in your corner.

Kam K.
Verified Client
Google 5.0 ★★★★★
Criminal Defense Attorney
William J. Duffy
Criminal Defense Attorney
Years of Experience
0 +
Clients Represented
+
Jury Trials Handled
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Of experience
0 Years

Trusted Legal Defense from an Experienced Orange County Insider

William J. Duffy hasn’t just studied the law—he’s lived it in the trenches of Southern California’s courtrooms.

He started out defending people in San Bernardino and Riverside Counties, standing next to clients who were often facing the toughest moments of their lives.

Those early years in the trial courts, combined with his work in the L.A. County District Attorney’s Justice System Integrity Division, gave him a front-row seat to how the justice system really works. That perspective shaped the way he practices today: practical, steady, and focused on real people and real results.

Experienced Attorneys

Skilled lawyers with years of proven success.

24/7 Legal Support

Always available to guide and protect your rights.

Duffy image

William J. Duffy

Managing Attorney

Our Legal Services for You

We stand beside people in some of the hardest moments of their lives, offering clear guidance, strong advocacy, and a track record of real results for both victims and those accused or suspected of criminal wrongdoing.

Orange County DUI Defense

Facing a DUI in Irvine or Newport Beach? From DMV APS hearings to complex court litigation, we fight to protect your license and your future.

Domestic Violence & Spousal Battery

We specialize in pre-filing dismissals and modifying protective orders. Don’t let a single dispute redefine your family life.

Relentless Trial Advocacy

With over 20 jury trials, we don't back down. We provide seasoned expertise and a heartfelt commitment to your defense in court.

Post-Conviction Relief

Clean up your criminal record. We help with expungements and reducing felonies to misdemeanors to restore your rights.

Victim’s Rights Advocacy

We stand by victims of crime to ensure their voices are heard and they receive the restitution they deserve under Marsy's Law.

criminal-custody

Theft & Drug Crimes

Aggressive representation for possession, sales, and theft charges. We prioritize rehabilitation and getting your life back on track.

Success Through Justice

Every case tells a story. From inception of case through jury trial, if necessary, our dedicated team has secured outstanding results for clients facing criminal charges.

Domestic Battery / Spousal Abuse

Expert legal representation for domestic violence charges, spousal abuse allegations, and battery defense. We provide aggressive advocacy to protect your rights, minimize penalties, and safeguard your future.

Sexual Assault

Discreet and rigorous defense against sexual assault allegations, felony sex crimes, and misconduct charges. Our experienced criminal defense attorneys fight to ensure a fair trial and protect your reputation.

Courts We Serve

I appear regularly in the local courts where your case will actually be decided. My familiarity with judges, prosecutors, and court staff allows me to navigate the system smoothly while avoiding rookie pitfalls.

Orange County

Harbor Justice Center 4601 Jamboree Road, Newport Beach
West Justice Center 8141 13th Street, Westminster
Central Justice Center 700 Civic Center Drive W., Santa Ana
North Justice Center 1275 N. Berkeley, Fullerton

Serving Irvine, Newport Beach, Costa Mesa, and all OC communities.

Regional Defense

Extending elite legal defense to surrounding Southern California jurisdictions:

Los Angeles County Riverside County San Bernardino County

"Wherever your case is filed, my knowledge of local procedures allows me to position your case for the best possible outcome."

What Our Valued Clients Say About Us

Read honest client reviews and success stories from individuals we’ve represented in criminal defense and litigation cases. We take pride in delivering justice with integrity, dedication, and trusted legal expertise. Our clients’ voices reflect the true strength of our firm and our commitment to achieving the best possible legal outcomes.

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Andrew OCONNELL profile picture
Andrew OCONNELL
58 days ago
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Mr Duffy went out his way to help me.I highly recommend him.
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Edwin Canas profile picture
Edwin Canas
74 days ago
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Thank you, Bill. When I first met Bill Duffy, I was going through one of the darkest periods of my life. What I found in Bill was not only an excellent attorney, but a compassionate person who genuinely cared about my well-being and recovery. Throughout the process, Bill treated my wife and me with respect, dignity, and understanding. He never lost sight of the fact that behind every legal case is a human being trying to find their way forward. One piece of advice he gave me was to continue prioritizing my recovery and my family. Those words stayed with me. Today, I am continuing my recovery journey, rebuilding relationships, sponsoring other alcoholics, and living a life with purpose and gratitude. This experience was painful, but it became the beginning of a new chapter in my life. Bill helped guide me through it with professionalism, integrity, and compassion. I am deeply grateful for his help and would highly recommend him to anyone looking for an attorney who not only understands the law, but also understands people, recovery, and restoration. Thank you, Bill, for helping me move forward with hope and dignity. Edwin Cañas. Happy Father’s Day weekend .
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Diana Qvdo profile picture
Diana Qvdo
90 days ago
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Attorney William Duffy made a difficult process much easier to navigate. He took the time to explain each step clearly, kept me informed, and made sure I always knew what to expect. What stood out most was not only his knowledge and experience, but also the relationships and reputation he has built throughout the court system, from the DA’s office to the judges. You can tell people know and respect him, and that made a real difference. His professionalism and dedication helped achieve the best possible outcome which exceeded my expectations. I’m extremely grateful for his guidance and genuine support. If you’re looking for an attorney who is knowledgeable, compassionate, and effective, I would highly recommend William Duffy.
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Kam Kas profile picture
Kam Kas
91 days ago
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Duffy was the calming voice I needed when I was facing legal issues. His protective nature and sense of humor always put me at ease. As an attorney, he was very professional and absolutely effective when it came to handling my case work. I would recommend him and you will too.
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Gary Mcclain profile picture
Gary Mcclain
92 days ago
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I had an excellent experience working with Mr. Duffy. From the very beginning, he was professional, knowledgeable, and responsive to all of my questions and concerns. He took the time to explain every step of the process, making sure I understood my options and felt confident in the decisions being made. Mr. Duffy’s attention to detail, dedication, and commitment to achieving the best possible outcome were evident throughout my case. I always felt that my interests were a top priority, and his expertise helped make a potentially stressful situation much easier to navigate. I highly recommend Duffy Law to anyone seeking reliable, trustworthy, and effective legal representation. Thank you for your hard work and outstanding service
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gabriel vivan profile picture
gabriel vivan
100 days ago
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I want to sincerely thank Duffy Law for the outstanding work he did on my father’s criminal case. As his client, I was incredibly impressed with how professionally and committed he handled everything from the very beginning. He kept us informed every step of the way, explained all our options clearly, and fought hard for the best possible outcome. I’m very satisfied with the results and truly appreciate his dedication and expertise during what was a difficult time for our family. He made a stressful situation much more manageable. If you need a skilled and reliable attorney, I highly recommend him. He is The “real Lincoln Lawyer.”
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Todor Tanev profile picture
Todor Tanev
129 days ago
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I can’t recommend Bill Duffy enough! He recently got my traffic ticket completely dismissed, and the entire process was smooth, professional, and stress-free from start to finish. What really stood out is his dedication—not only did he take great care of my case, but he’s also been actively helping another driver from Black Car Newport get their ticket dismissed as well. That level of commitment and consistency speaks volumes. If you’re looking for a reliable, knowledgeable, and results-driven traffic attorney, Bill is the one to call. Truly 5-star service! ⭐⭐⭐⭐⭐
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Jamie Kay profile picture
Jamie Kay
143 days ago
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Mr. Duffy came to me in a time of desperate need for a professional, honest, thorough and respected lawyer. I was beyond lucky to have him on my case. He is honest, is not just going to tell you want to hear, but will also fight for you for the best possible outcome the justice system will provide you under whatever circumstances you are facing. His reputation and knowledge are beyond what I was aware of when he began representing me. If you want experienced, straightforward yet empathetic council who will go out beyond his responsibilities to you on your case, he is the right man for the job. I was terrified facing my legal woes and my world felt upside down. He stepped in and treated me with consideration, truthfulness and professionalism. Nobody wants to go through any defensive charge, yet I felt very taken confident in his care and guidance. For me, with years of anxiety issues, I couldn’t have asked for a better professional to manage my case. He put me at ease and I knew that things works work out just fine with his help. I have zero complaints and nothing but deep appreciation for this man and how he walked me through every step of the process with patience and clear communication. I would advise anybody facing a challenge of a defensive charge to seek out the help of Mr. Duffy. You could not put yourself in better hands. I have nothing but appreciation and respect.
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Cong Mu profile picture
Cong Mu
163 days ago
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Hired them 7 years ago and they delivered outstanding results. Came back recently for more help, and they provided excellent assistance for free. That level of loyalty and generosity is rare. Highly knowledgeable, responsive, and client-focused. Would recommend them without hesitation. Also the AI interface on their website is great, you should try.
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Abel profile picture
Abel
166 days ago
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An outstanding lawyer, he kept through informed through my whole process and help me with my case with the overall results. I was very happy and satisfied I would definitely recommend him.
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Mr.J_22 profile picture
Mr.J_22
166 days ago
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He was awesome he kept me in the loop and made sure I was feeling heard my concerns were his and that I felt comfortable with decisions Being made. I definitely would recommend him
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Benny Leon profile picture
Benny Leon
188 days ago
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If you are looking for a defense attorney in Orange County, Will Duffy is the person to call. He helped me navigate a difficult DUI case with total professionalism, and now that I’m eligible, he’s handling my expungement to help me move forward. He has a way of explaining complex legal jargon in plain English, so I never felt lost. I can’t recommend him enough for anyone in the Irvine area needing a fresh start.
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kelly kettle profile picture
kelly kettle
218 days ago
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My fianc’e and I were really scared, Mr. Duffy took the time to explain what to expect, and delivered on everything, really going above & beyond! Thank you Mr. Duffy!
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Peter Robles profile picture
Peter Robles
252 days ago
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I cannot recommend Bill Duffy highly enough. From our very first conversation, it was evident that Bill is not only an outstanding attorney but also a genuinely good man. Throughout my case, he demonstrated professionalism, integrity, and deep care. Bill always made sure to explain every detail clearly, advocating for me with both confidence and impressive skill. What truly distinguishes Bill is his unwavering Christian morals and the authentic way he lives them out. He showed me compassion and kindness that far exceeded my expectations for an attorney. For example, Bill thoughtfully bought me a Bible and personally invited me to his church. This gesture meant more to me than words can express and showed me that he genuinely cares about people, not just the cases he handles. If you are searching for a lawyer who is not only highly skilled and trustworthy but also guided by faith and strong moral values, Bill Duffy is the person you want by your side.
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Anush Sadjadi profile picture
Anush Sadjadi
259 days ago
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From the time I met him you made me feel like he understood what I was going through and you wanted the best for me. He definitely went above and beyond where I paid him for and I'll always be grateful to him. He's a great attorney. And I have to say he's a great friend. Thanks William.

Frequently Asked Questions

Navigating the criminal justice system in Orange County can be overwhelming. We’ve compiled answers to the most common questions our clients ask during their first consultation. If you don’t find the answer you need here, call our Irvine office at (949) 620-3308 for a confidential case evaluation.

Talk to Our Attorneys

Get in touch with our legal experts today.

Do not make any statements to law enforcement. Clearly state that you wish to remain silent and want an attorney present. Contact us immediately so we can protect your rights from the very first hour.

Yes. For DUI cases, you only have 10 days from your arrest to request a hearing with the California DMV to save your license. We handle the paperwork and the hearing for you.

In most misdemeanor cases, we can appear on your behalf under Penal Code 977, so you don't have to miss work. For felonies, your presence is typically required unless we've secured a specific excusal.

We offer transparent, flat-fee pricing for most criminal matters and arrange flexible payment plans. We accept all major credit cards and provide a realistic cost estimate during your initial consultation.

You can easily schedule an appointment through our website or by contacting our office directly.

William J. Duffy is a former public defender with over 18 years of local experience and more than 20 jury trials. We offer a "client-first" approach, combining relentless trial advocacy with a focus on rehabilitation and second chances.