American advertising executive and campaign manager who served as White House chief of staff during the Richard M. Nixon (Nixon, Richard M.) administration (1969–73). He is best known for his involvement in the Watergate Scandal.

Haldeman graduated from the University of California at Los Angeles in business administration (1948). He joined a prominent advertising agency in 1949 and became an account executive and then, in 1959, vice president of the firm's Los Angeles office.

He worked in a number of Nixon's campaigns, managing Nixon's ill-fated attempt to become governor of California in 1962 and managing Nixon's second campaign for the presidency in 1968. During Nixon's first term, Haldeman served as chief of staff, determining access to the president and running the White House in such an efficient manner as to earn the nickname “the Iron Chancellor.”

Following the June 17, 1972, break-in at Democratic National Headquarters at the Watergate complex, Haldeman participated in the White House cover-up of official involvement in that event as well as other “dirty tricks” employed during the 1972 campaign. When the White House became implicated in the spring of 1973, Haldeman resigned. He returned to his home in California but in 1975 was convicted of perjury, conspiracy, and obstruction of justice for his role in the scandal.

Sentenced to 2 ¹/₂ to 8 years in jail, Haldeman actually served 18 months at a federal minimum security facility. He was released in late 1978, and his autobiographical The Ends of Power was published that same year. He subsequently engaged in real estate and restaurant ventures.