U.S. district court judge whose search for the truth about the 1972 Watergate (Watergate Scandal) break-in was the first step leading to the resignation of President Richard M. Nixon (Nixon, Richard M.).

Sirica was raised in poverty in several eastern American cities and, after supporting his studies by boxing, received his law degree from Georgetown University (1926). He was an assistant United States attorney (1930–34) and then was active in private practice. In 1957, President Dwight D. Eisenhower appointed him a district court judge for the District of Columbia. By 1971 his seniority had made him the court's chief judge.

At the trial of the seven Watergate burglars in 1973, presiding Judge Sirica's close questioning of witnesses led to defendant James McCord's implicating officials of the Nixon administration in the crime. In two years of Watergate trials that Sirica heard, his most significant ruling was that Nixon was obligated to deliver evidence, including White House tape recordings, in response to a subpoena from the prosecution; the United States Court of Appeals later upheld Sirica. He ordered that the grand-jury report on Nixon be delivered to the U.S. House of Representatives impeachment investigation, and he presided at the trials of Nixon's closest assistants, including John Mitchell, H.R. Haldeman, and John Ehrlichman. He retired from the bench in 1986, at the age of 82.