John Patrick Hartigan (December 29, 1887 – August 10, 1968) was Attorney General of Rhode Island, a United States district judge of the United States District Court for the District of Rhode Island and a United States Circuit Judge of the United States Court of Appeals for the First Circuit.

Career output and lasting influence
Opinions attributed per year · peak 17/year
Later decisions citing those opinions, per year · peak 195/year
Rhode Island District Court · 1940–1951First Circuit Court of Appeals · 1951–1968
Both charts share the same year axis. Opinion counts include only opinions in our corpus attributed to this judge so far — a year at zero can mean an attribution gap, not judicial silence. Influence typically outlasts the career: citations keep climbing after the last opinion.
- Gender
- Male
- Race
- White
Prior employment
- State of Rhode IslandAttorney general · 1933–1939
- Private practice, Providence, Rhode Island1912–1933
State of Rhode IslandAssistant attorney general · 1923–1924
U.S. Army1917–1918
Appointments
1951–1968 · Appointed by Harry S Truman (Democratic)Term ended: Death
1940–1951 · Appointed by Franklin D. Roosevelt (Democratic)Term ended: Appointment to Another Judicial Position
Education
- Harvard University
- Columbia UniversityA.M. · 1913
LL.B. · 1913- Brown UniversityA.B. · 1910