Thomas Frank Gailor (September 17, 1856 – October 7, 1935) was the third bishop of the Episcopal Diocese of Tennessee in the Episcopal Church and served from 1898 to 1935.
Gailor was prepared in the preparatory department of, then graduated Bachelor of Arts from, Racine College in Wisconsin. Bishop Charles Todd Quintard of Tennessee was an ardent supporter of Racine and its brilliant Rector, the Reverend James DeKoven (1831-1879). Racine was modeled on both the College of St. James's in Maryland (founded 1842) and St. Peter's College, Radley UK (founded 1847). Both were outstanding schools. St. James's and Racine were inspired by the scholastic philosophy and practice of William Augustus Muhlenberg (1796-1877), founder of two model schools on Long Island in 1828 and 1836. Muhlenberg is considered the father of the Church school movement in America, an energy which gave rise to some of the best college preparatory schools in the United States. Gailor was well prepared indeed and became a fine scholar. He taught at Sewanee and went on to serve as Vice-Chancellor (President) then, after his election to the episcopate, served as the VIII Chancellor of the University of the South in Sewanee, Tennessee (June 23, 1908, until his death). In 1916 Gailor was elected president of the House of Bishops, and at the 1919 General Convention he was elected president of the National Council of the Episcopal Church. He served in this position until 1925, when the Episcopal Church's first elected presiding bishop began his six-year term.
In 1921 he received an honorary degree in Doctor of Laws from Oglethorpe University.
On June 25, 1924, he offered the invocation at the opening of the second day of the 1924 Democratic National Convention.
In 1923, his daughter, Ellen Douglas Gailor, married Richard Folsom Cleveland, son of former President Grover Cleveland.