Cassius McLean Shartel (April 27, 1860 – September 27, 1943) was a U.S. Representative from Missouri.

Cassius McLean Shartel
Member of the U.S. House of Representatives from Missouri's 15th district
In office March 4, 1905 – March 3, 1907
Preceded by	Maecenas E. Benton
Succeeded by	Thomas Hackney
Personal details
Born	Cassius McLean Shartel (1860-04-27)April 27, 1860 Crawford County, Pennsylvania, U.S.
Died	September 27, 1943(1943-09-27) (aged 83) Neosho, Missouri, U.S.
Resting place	Odd Fellows Cemetery, Neosho, Missouri
Political party	Republican

Born in Crawford County, Pennsylvania, Shartel moved with his parents to Knox County, Missouri, and resided there until 1873. He moved with his parents to Chautauqua County, Kansas. He attended the common schools and Kansas State Agricultural College at Manhattan. He taught school. He studied law. He was admitted to the bar in 1881 and commenced practice in Sedan, Kansas. He moved to Nevada, Missouri, in 1887 and then to Neosho, Missouri, the same year and continued the practice of law. He served as delegate to the Republican National Conventions in 1900 and 1936.

Shartel was elected as a Republican to the Fifty-ninth Congress (March 4, 1905 – March 3, 1907). He was not a candidate for renomination in 1906. He was interested in farm loans. He served as president of the Missouri constitutional convention in 1922 and 1923. He died in Neosho, Missouri, September 27, 1943. He was interred in Odd Fellows Cemetery.