John Helm Pratt (November 17, 1910 – August 11, 1995) was an American lawyer and judge. Born in New Hampshire, Pratt spent most of his life in the Washington, D.C. area, where he practiced law for 34 years before being appointed as a United States district judge of the United States District Court for the District of Columbia in 1968 by President Lyndon B. Johnson. As a federal judge, Pratt presided over a number of significant cases, including the Watergate trial of G. Gordon Liddy and civil rights cases involving school desegregation and discrimination based on sexual orientation.

John Helm Pratt
District of Columbia District Court
Born 1910 in Portsmouth, NH
Died 1995 in Chevy Chase, MD
FJC ID: 1930
- Gender
- Male
- Race
- White
Prior employment
- Private practice, Washington, D.C.1934–1942, 1946–1968
- U.S. Marines captain1942–1946
Appointments
1968–1995 · Appointed by Lyndon B. Johnson (Democratic)Term ended: Death
Education
LL.B. · 1934- Harvard UniversityA.B. · 1930