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.

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.

• List of United States senators born outside the United States

• United States Congress. "Walter Lowrie (id: L000485)". Biographical Directory of the United States Congress.