Shaw 3 Law Firm
“He make the whole immigration visa process easy and simple for us.”
Best Business Attorneys in Ontario, CA
15 firms listed · 8 in Ontario · 1 open 24/7 · 2 open weekends · 13 rated 4.5+
Data verified October 31, 2026
Herrera LAW
“He even helped my dad get money for the loss of use of his car from the time of the accident until the date the insurance company made my dad an offer on the total loss of his car.”
Empire Business Law
“He kept us informed throughout the entire trademark registration process and made sure we understood the process.”
Merritt Law
“If you are looking for someone who is professional, detail oriented and goes above & beyond than give Attorney T.”
Blucker Law & Associates
“It was very clear on what to expect and I was able to alleviate my stress in patiently answering all my questions and was also very clear on the cost aspect.”
Sabbah & Mackoul
The 15 firms shown for Ontario, CA advise companies on formation, contracts, ownership agreements and transactions. Whatever each one says about its practice areas and fee arrangements is drawn from its own website, and the ratings come from public reviews.
Area overview: Ontario, CA
Of the 15 firms we list here, 8 are in Ontario itself and 7 come from Rancho Cucamonga (6 mi). The firms on this page are rated from 3.8 to 5.0 across 966 reviews; 5 have 50 or more reviews and 13 are rated 4.5 or higher. When clients rate these firms on specific qualities, they most often praise professionalism (93%), responsiveness (84%) and quality (82%). The topics that come up most in reviews of the firms on this page are "trust", "communication" and "knowledge". 1 is open around the clock; 2 are open on Saturdays and 1 on Sundays. The practice areas the firms on this page list most often on their websites are business law (3), personal injury (3), bankruptcy (2), business litigation (2) and civil litigation (2). 1 shows a license on its website and 2 have a BBB rating of A or A+. 9 have ten or more years of experience, the longest 31 years. 1 offers urgent consultations; 1 offers payment plans; 5 offer a free initial consultation and 1 is family- or locally-owned. 1 has Spanish-speaking staff. We count these figures across the firms on this page; distances are straight-line, and hours and prices change, so confirm the details with the firm before you book a consultation.
Which business law firms listed for Ontario describe their corporate work online?
A website is on file for 14 of the 15 firms listed here. Corporate pages tend to be concrete about industries served, transaction types and the size of company the practice acts for. That detail rules firms in or out faster than any phone call.
McCune Law Group
“Any time I had any kind of a question they answered me quickly and in language I could understand, not just lawyer's words.”
Law Offices of Rob Rodriguez
“I am satisfied with the service and support they provided me, they resolved all my doubts.”
Atlantis Law Firm
“James is extremely knowledgeable, he answered all my questions, never rushed us, and provided a great deal for my trust.”
David H. Ricks & Associates
“Outstanding, fast response, knowledgable, professional service made David H Ricks a total pleasure and joy to work with.”
YAZ Legal Services, INC
“Susan is very knowledgeable and was amazing help in helping me file the paperwork I needed for my case.”
Law Office of Priscilla Solario
“She listened and was attentive to our needs regarding the Trust and answered any questions we had.”
CKB Vienna
“Looking for a divorce lawyer call Thomas Mc Coll you will not regret it.”
Law Offices of Douglas Borthwick
“I highly recommend him to anyone looking for a knowledgeable, reliable, and trustworthy attorney.”
Chung & Ignacio
“Thank you Carlo, you were a great help in this difficult time I'm experiencing.”
Why these companies made our list
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