Rufus Cecil Holman (October 14, 1877 – November 27, 1959) was an American politician and businessman who served as a United States senator for a single term during World War II. He was an officer in the Ku Klux Klan during the 1920s, then served as Oregon State Treasurer. He was a member of the Multnomah County Board of Commissioners.

Running for re-election in May 1944, Holman was defeated in the Republican primary by Wayne Morse.

Holman was born in Portland, Oregon, on October 14, 1877. He was educated in public schools and became a teacher in 1896.

After leaving teaching in 1898, he worked in various fields from farming and operating a steamboat, to pursuits related to the accounting field until 1910. That year, Holman began making record keeping books and paper boxes in Portland. He then worked in the cold storage business and was active in civic affairs.

Holman won his first election to political office in 1914, when he was elected to the Multnomah County Board of Commissioners, where he served two four-year terms (1914–1922)

During the mid-1920s, Holman was an active member of the Ku Klux Klan in Oregon, serving as an officer.

In 1931, Oregon Governor Julius L. Meier appointed him as state treasurer after Thomas B. Kay died in office. He began in office on May 1, 1931, winning election to a full four-year term in 1932, and winning re-election in 1936. He resigned from the office in 1938, leaving on December 27, 1938.

Holman was strongly concerned about the environment. In 1937, he garnered publicity when he demonstrated the polluted state of the Willamette River by briefly holding a cage of salmon in the water, then quickly pulling them out dying to a shocked audience.