---
title: "Mary C. Deneen | KnowJudges"
canonical: "https://knowjudges.com/kyj/judge/mary-c-deneen-ct"
page_type: "judge_profile"
updated: "2026-10-07"
---

# Mary C. Deneen

Greater Windsor Probate Court · Probate Judge

## Profile

- Court: Greater Windsor Probate Court
- State: Connecticut
- Role: Probate Judge
- Service status: active

## Summary

Mary C. Deneen — Greater Windsor Probate Court

## Sources

- [Court Locator](https://www.ctprobate.gov/court-locator)

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## Biography

### Professional career

- Legal internships: U.S. Attorney’s Office, Bacon Wilson, P.C., Buckley Wynne & Parese
- Judge of the Greater Windsor Probate District in Connecticut
- She has also interned with the U.S. Attorney’s Office, Bacon Wilson, P.C., and other legal firms

### Education


### Additional information

- Joined the law firm O’Malley, Deneen, Leary, Messina & Oswecki in October 2020.
- Law Review: Western New England Law Review, recipient of the “Outstanding Note Award” (2019) and “Benjamin D. Novak Award” (2020)
- Court location: Town Hall, 1540 Sullivan Avenue, South Windsor, CT 06074
- Hours: Monday–Friday, 8:00 a.m.–4:00 p.m.
- Contact: (860) 644‐2511 ext.
- overseeing probate matters for East Windsor, South Windsor, and Windsor.
- Her legal expertise includes estate planning, probate matters, and residential real estate.
- The court serves East Windsor, South Windsor, and Windsor and handles a range of probate and related cases, including trusts, estates, conservatorships, and guardianships southwindsorct.
- Current memberships: Connecticut Bar Association, Massachusetts Bar Association, Hartford County Bar Association, Hampden County Bar Association



## Published courtroom rules

### Shared court rules

- [Connecticut Probate Court Rule 66.1 — electronic participation](https://knowjudges.com/courtroom-rules/national-shared-set-c0aec96b376d18df89851f00) — Probate Courts only. Rule 66.1 was amended July 1, 2022 and retained in the July 2026 compilation. Electronic participation is discretionary, not an entitlement. Shared baseline only, not a judge-specific preference or complete local rules inventory. Apply source exceptions, case-type limits, later amendments and case orders. [Official source](https://www.ctprobate.gov/Documents/Probate%20Court%20Rules%20of%20Procedure.pdf). Collected 2026-10-27.