---
title: "William Avantaggio | KnowJudges"
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page_type: "judge_profile"
updated: "2026-10-07"
---

# William Avantaggio

Lincoln County Probate Court · Judge of Probate

## Profile

- Court: Lincoln County Probate Court
- State: Maine
- Role: Judge of Probate
- Service status: active

## Summary

William Avantaggio — Lincoln County Probate Court

## Biography

### Professional career

- The Judge of Probate in Lincoln County, Maine, a position he has held since first being elected in 2016
- Practicing attorney based in Newcastle, Maine, and has practiced law in Lincoln County since 1994
- Lincoln County probate judge in Maine, elected unopposed in 2016 according to .
- Began local legal practice in 1994 and opened his own office in 2002
- Maine Attorney General’s Office — contract attorney, guardianship cases

### Education

- Law degree, University of Maine School of Law

### Additional information

- Raised in Damariscotta, he attended St Lawrence University and later law school in Portland; the overview does not specify the law school or degree years.
- He also serves as president of the Maine Assembly of Probate Judges and has participated in state advisory committees on probate and judicial ethics
- His work focused on criminal and family matters, with additional property, landlord–tenant, injury and construction cases.
- Community service included the Mid-Coast American Red Cross board and youth-sports coaching at CLC YMCA.
- He is listed as a Maine Association of Criminal Defense Lawyers member.

## Sources

- [2026 Directory of Maine Counties](https://www.mainecounties.org/uploads/1/4/3/2/143228552/2026_directory_complete.pdf)

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## Published courtroom rules

### Shared court rules

- [Maine Rules of Probate Procedure, published compilation effective July 1, 2019](https://knowjudges.com/courtroom-rules/national-shared-set-7035949b391933326f2d42fe) — Probate Court proceedings. This 2019 compilation is retained as dated source evidence; later amendments have not been exhaustively checked. Section-specific exceptions, waivers, later amendments and case orders remain applicable. This is a source excerpt, not an exhaustive statement of the rule. [Official source](https://www.courts.maine.gov/rules/text/mr_prob_p_only_2019-04-11.pdf). Collected 2026-10-27.