Atty. Diego F. MacWilliam

Atty. Diego F. MacWilliam

The law firm of Diego F. MacWilliam, in San Jose, California, handles all aspects of civil litigation (serious persona injury cases, wrongful death actions, product liability, medical/dental malpractice, real estate and business litigation); criminal law (all felonies and misdemeanors); and family law (divorce, child custody and visitation, child and spousal support, and property division.

San Jose San Jose 34 yrs experience 34 year
Call (669) 330-1386 Book Appointment

Profile Summary

About Diego F. MacWilliam at a glance

Diego F. MacWilliam is a Member based in San Jose, California, practicing at Law Office of Diego F. MacWilliam. They have 34+ years of legal experience, licensed to practice since 1992. Their practice focuses on dui/dwi, drug crimes, personal injury, criminal defense, and family law. Admitted to practice in California U.S. District Court, Northern District of California (1992). Educated at Santa Clara University School of Law (J.D., 1990) and University of California at Berkeley (A.B. Legal, 1986). Recognitions include BV Distinguished. Active member of Santa Clara County Bar Association State Bar of California California Trial Lawyers Association California Public Defenders Association. Serands clients in San Jose, CA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • The law firm of Diego F. MacWilliam, in San Jose, California, handles all aspects of civil litigation (serious persona injury cases, wrongful death actions, product liability, medical/dental malpractice, real estate and business litigation)
  • criminal law (all felonies and misdemeanors)
  • and family law (divorce, child custody and visitation, child and spousal support, and property division
  • Attorney Diego F. MacWilliam has extensive experience in litigation, and has tried numerous jury and court trials
  • He is highly rated as a lawyer (“Excellent” rating by “Avvo.com” and “BV Distinguished” rating by Martindale-Hubbell)
  • Mr. MacWilliam graduated from the University of California, Berkeley, with a A.B. degree in Legal Studies, and Santa Clara University School of Law with a J.D. (Jurisprudence Doctor) degree
  • He is admitted to practice before all courts of the State of California, and the United States District Court for the Northern District of California
  • The firm has successfully represented clients throughout the State of California for more than 20 years
  • Mr. MacWilliam is fluent in Spanish

Practice Areas Explained

Diego F. MacWilliam's Areas of Practice

Each practice area below reflects the types of cases Diego F. MacWilliam handles, with a brief overview of what that area of law covers.

DUI / DWI Defense

Find experienced DUI and DWI defense attorneys near you. Compare verified profiles, read client reviews, and consult about your case for free.

Diego F. MacWilliam is one of 29,977 dui/dwi attorneys indexed nationally. Browse dui/dwi attorneys in California →

Drug Crimes

Diego F. MacWilliam is one of 6,966 drug crimes attorneys indexed nationally. Browse drug crimes attorneys in California →

Personal Injury

Personal injury attorneys help accident victims recover compensation for medical bills, lost wages, and pain & suffering. Most work on contingency — no fee unless you win.

Diego F. MacWilliam is one of 264,852 personal injury attorneys indexed nationally. Browse personal injury attorneys in California →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

Diego F. MacWilliam is one of 214,271 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in California →

Family Law

Family law attorneys handle divorce, child custody, child support, adoption, prenups, and protective orders. Find verified family lawyers near you.

Diego F. MacWilliam is one of 187,066 family law attorneys indexed nationally. Browse family law attorneys in California →

Jurisdictional Context

Why local counsel matters in California

Practicing law in California. Legal matters in California are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in San Jose are typically filed in the local municipal court or the appropriate California state district court, depending on subject matter and amount in controversy. An attorney licensed in California brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in California courts without local counsel or pro hac vice admission.

Looking for additional California attorneys? Browse all attorneys in San Jose or all attorneys in California.

Frequently Asked

Common questions about Diego F. MacWilliam

Where is Diego F. MacWilliam's law office located?
Diego F. MacWilliam's law practice is located in San Jose, California. The firm is Law Office of Diego F. MacWilliam. You can contact the office directly through this profile page.
What practice areas does Diego F. MacWilliam handle?
Diego F. MacWilliam focuses on dui/dwi, drug crimes, personal injury, criminal defense, family law. Each practice area listed reflects experience handling cases of that type in California.
How long has Diego F. MacWilliam practiced law?
Diego F. MacWilliam has 34+ years of legal experience and has been licensed since 1992.
Where did Diego F. MacWilliam go to law school?
Diego F. MacWilliam earned their education at (J.D., 1990); (A.B. Legal, 1986).
How can I contact Diego F. MacWilliam for a consultation?
You can contact Diego F. MacWilliam directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.
What awards or recognition has Diego F. MacWilliam received?
Diego F. MacWilliam's notable recognition includes: BV Distinguished.

Education

J.D.
Santa Clara University School of Law
- 1990
A.B. Legal
University of California at Berkeley
- 1986

Awards

BV Distinguished

Bar Admissions

California U.S. District Court, Northern District of California
Admitted: 1992

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