| Principal Administrator | Tom Monaghan |
| Founded | 1926 |
| School type | Public school (U.S.) |
| Religious affiliation | None |
| Location | Houston, Texas, United States |
| Enrollment | 1,422 students |
| Campus surroundings | Urban |
| Mascot | Pups (The Purple Pup) |
| School colors | Red, Purple |
Sidney Lanier Middle School is a secondary school located at 2600 Woodhead Street in Houston, Texas with a ZIP code of 77098. Lanier, which is a school of the Houston Independent School District, handles grades 6 through 8.
Lanier Middle School is located in the Montrose area of Houston, and has both neighborhood and Vanguard gifted/talented programs.
The cafeteria of Lanier Middle School has a 1950's-style "Pup Rock Cafe" sign, a spoof on Hard Rock Cafe.
Lanier's speech and debate team won two national titles, one of which being at the 2004 National Junior Forensic League Speech and Debate Championships.