Walter Lowrie (December 10, 1784 – December 14, 1868) was a politician from Butler County, Pennsylvania. He served in both houses in the state legislature and represented Pennsylvania in the United States Senate. Serving as chairman of the Committee on Finance during the 2nd session of the 17th Congress.

Walter Lowrie
3rd Secretary of the United States Senate
In office December 12, 1825 – December 5, 1836
Preceded by	Charles Cutts
Succeeded by	Asbury Dickins
United States Senator from Pennsylvania
In office March 4, 1819 – March 4, 1825
Preceded by	Abner Lacock
Succeeded by	William Marks
Personal details
Born	(1784-12-10)December 10, 1784 Edinburgh, Scotland
Died	December 14, 1868(1868-12-14) (aged 84) New York City, U.S.
Political party	Democratic-Republican

After his term as a Senator, Lowrie stayed on as secretary of the Senate for eleven years. In 1836 he moved to New York City and went to work with the Missionary Board of the Presbyterian Church. He remained with them until his death. Three of his sons, John Cameron, Walter Macon, and Reuben, were prominent as missionaries to India and China. A nephew, Walter H. Lowrie, later served as chief justice of Pennsylvania's Supreme Court.

Lowrie died in New York City on December 14, 1868, and is interred in the First Presbyterian Church in Manhattan.