Lannius, formerly Stephensville, is an unincorporated community in Fannin County, Texas, United States.

[1] Lannius was first settled by William Onstott, Richard Overton, Ira Isham, and W. W. Bowman in 1836, naming it Stephensville.

After receiving a post office in 1891, they changed their name to Lannius, after landowner William Lannius, due to Stephenville, Texas already existing.

[2] Lannius was one of the Texas areas listed for viewing the solar eclipse of April 8, 2024.

This article about a location in Fannin County, Texas is a stub.