Marion DeKalb Taylor or M. D. K. Taylor (October 13, 1818 – June 22, 1897) was an American politician in Alabama and Texas, as well as a general in the Confederate army during the American Civil War. He was a member of the Alabama Legislature for two stints between 1842 and 1846, and served in both the Texas House of Representatives and the Texas Senate. In the Texas House, Taylor served three non-consecutive terms as Speaker of the House, and, in the Texas Senate, was twice elected President pro tempore of the Texas Senate.
Taylor was born in Jones County, Georgia to Anne Mathews and Ward Taylor, who was a blacksmith, farmer, and Methodist preacher. The family had moved to Butler County, Alabama, by 1822. M. D. K. Taylor received his education in Alabama and studied medicine there. Taylor married the 14-year-old Elizabeth Sarah McDaniel in 1838 and, for the next 24 years, they would have some nine children together. Taylor was elected to the Alabama Legislature from Butler County in 1842. He was an advocate for the annexation of Texas, a position which cost him re-election in 1844. However, he was again sent to the Alabama Legislature in 1845, serving through the following year.
In January 1847, Taylor and family moved to Cass County, Texas (present-day Marion County), where he served as Postmaster for a time. He was elected to the House of Representatives of Third Texas Legislature (1849–1851), and the Senate of the Fourth Legislature from District 5 (1851–1853). After a Senate redistricting, Taylor was elected from the 7th District for the Fifth, Sixth, and Seventh Legislatures (1853–1859). In the Fifth Legislature, Taylor was elected President pro tempore of the Senate, a position he also held for part of the Seventh Legislature.