|Director of the Bureau of the Budget|
January 22, 1969 – June 30, 1970
|Preceded by||Charles Zwick|
|Succeeded by||George P. Shultz (Office of Management and Budget)|
|Born||March 15, 1916|
Seattle, Washington, U.S.
|Died||January 25, 2003 (aged 86)|
Elgin, Illinois, U.S.
|Education||University of Washington, Seattle (BA, MA)|
Robert P. "Bob" Mayo (March 15, 1916 – January 25, 2003) was a director of the United States' Office of Management and Budget from January 22, 1969 until June 30, 1970. He was the last person to lead this agency under its former name of the Bureau of the Budget.
Mayo was born in Seattle, Washington, the only child of Carl Asa and Edna Alberta (Nelson) Mayo. He attained a bachelor's degree in business from the University of Washington in 1937 and earned a master's degree in economics from the school in 1938. He found employment with the Washington State Tax Commission as an auditor; he was soon promoted to become the organization's director of research.
In 1941, Mayo joined the staff of the Department of Treasury. He began his work as an economic analyst. He eventually rose to the rank of assistant to the Secretary of Treasury for debt management. He left government in 1961 to serve as vice president of Continental Illinois Bank with former colleague David M. Kennedy, who worked with him in the Department of Treasury. Mayo supervised the public affairs and trust investment operations of the bank. He also was a leader in efforts to develop black capitalism in Chicago. 
Known for his detail orientation and conservative views on spending from his time in Washington, Mayo was chosen in 1969 by incoming President Richard Nixon to develop his initial policy budgets; Mayo was considered to be a proponent of Nixon's black capitalism programs, which were designed to boost the economic fortunes of African Americans through loans and investment in black-owned business. In 1970, Nixon appointed Mayo as head of the Federal Reserve Bank of Chicago, which allowed him to return to his adopted hometown. He retired from this role in 1981. At the time of his death in 2003, he was a board member of the Chicago YMCA.
- "Mayo, Robert P(orter)". Current Biography. The H. W. Wilson Company. 1970. p. 282.
- "Mayo, Robert P(orter)".Current Biography. The H. W. Wilson Company. 1970. p. 282.
| Director of the Bureau of the Budget
George P. Shultz
as Director of the Office of Management and Budget