Bryant Thomas Castellow (July 29, 1876 – July 23, 1962) was an American politician, Congressman educator, lawyer, and Judge Castellow was born near Georgetown, Quitman County, Georgia.

He attended high schools in Eufaula, Alabama and Coleman, Georgia.

After admittance to the state bar that same year, Castellow became a practicing lawyer in Fort Gaines, Georgia in 1898.

Castellow served as superintendent of the Coleman public schools in 1897 and 1898, captain in the Georgia State Troops, from 1899 until 1902 and solicitor of Clay County Court from 1900 through 1901.

In 1913, he became the solicitor general of the Pataula, Georgia, judicial circuit and remained in that position until 1932, when he successfully ran for office in the U.S. House of Representatives to replace the recently resigned Charles R. Crisp.