A Highly Regarded Legal Team That Puts The Client First

At O'Neill Law Firm, we approach every case with a client-focused mindset, addressing family law, divorce and criminal defense legal issues. Our founding lawyer, Sean O’Neill, has nearly 30 years of legal experience and dedication to the La Crosse community. He serves clients throughout Western Wisconsin.

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Trust In A Seasoned Legal Team For Clear Guidance In Your Family Law Issues

You know what you want in your divorce, and you should have an attorney who knows how to help you get it. Our founder, Sean O’Neill, has almost 30 years of experience. He knows what goes on in a divorce courtroom and always keeps our clients’ goals at the forefront during negotiations and at trial.

At O'Neill Law Firm, we are dedicated to providing each client with experienced, personalized attention to resolve family law and divorce matters. We diligently protect our clients’ rights in areas such as divorce, property division, child custody, alimony and support.

We aim for amicable and effective solutions and in the courtroom, you will know that you have a team that will fight for you every step of the way, whether your concerns involve financial support, custody or your rights to visitation.

Practice Areas

Serving One Client At A Time
In La Crosse And Throughout Western Wisconsin

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Criminally Accused? Pick a Legal Team That Fights For You

When our clients are facing criminal charges, we vigorously defend their rights, providing strategic guidance to address felonies and misdemeanors.

We offer steadfast legal representation during uncertain times, helping our clients navigate and overcome their challenges.

Work WIth Our Firm – Schedule Your Consultation Today

At O'Neill Law Firm, you will receive aggressive representation that puts your best interests first. Whether you need assistance with a divorce or criminal defense, we are here to help. Let’s find a solution to your problem today. Contact our La Crosse-based office at Call or use our online contact form.

What Our Clients Say

Timely and Honest

“Some time ago I ran into some legal issues. I was a little embarrassed, and didn’t look forward to having the conversation to an attorney. Sean was extremely professional and respectful, and I felt like I was talking to an ally vs. a paid representative. See his billing philosophy posted on his site, and he “walked the walk” on that too. My legal results were better than expected. Client Review of Attorney Sean O’Neill”

– Client review of attorney Sean O’Neill

Helped me when I needed it most!

“He had cleared up the confusion of my case and pointed me in the right direction with confidence. Responded to a message I left with his assistant promptly and an over-all straight forward advisor. He never left me in the dark and got to the case to a fair conclusion. Thanks Sean!”

– Steven Haas, a criminal defense client

Excellent Attorney–Highly Recommended

“A very complicated homicide case that could of went either way. On the eve of trial, Attorney ONeill worked a plea deal with the district attorneys office that resulted in less than a fourth of the time if there had been a jury conviction. This was not an easy case and involved issues of toxicology and cause of death. His knowledge and expertise of the case, along with his long hard work brought about many defense issues that softened the DA led to this positive result that was very much appreciated. I highly recommend Sean ONeill. Simply put. He gets results!”

– Daniel, a criminal defense client

Expertise and Professionalism

“Upon the recommendation of a friend, I enlisted Sean O’Neill as my attorney to represent and guide me in a divorce action I was faced with. During our working relationship, I immediately discovered he possessed a full knowledge of the law and carried out his representation with authority, expertise and professionalism. He responded to my questions via e-mail, telephone calls and written communication promptly and with clear instruction. He, without fail, kept me updated with accurate, thorough and timely billing invoices. I truly admire, trust and believe in Sean O’Neill and would recommend him, without hesitation, to anyone desiring a positive and successful outcome regarding any legal issue they may encounter.”

– Jean, a divorce client

Case Results

Big win in divorce case after trial

Probation in Major Child Abuse Case

Misdemeanors come out of major felony reckless endangerment case

Serious ES revocation dropped

Juvenile waiver hearing won

Strangulation and battery acquittal by jury

State v. Greenwood drunk driving jury acquittal

Big divorce victory — alimony for male spouse

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