TMJ may refer to:
Temporomandibular joint connecting the jaw to the skull Temporomandibular joint dysfunction, pain in the jaw Ten Mile Junction LRT station, a closed Light Rail Transit station in Singapore on the Bukit Panjang LRT line (LRT station abbreviation: TMJ) Ten Mile Junction Depot, the depot for the Bukit Panjang LRT line Tohoku Mathematical Journal The Milwaukee Journal, a forerunner newspaper to the current-day Milwaukee Journal Sentinel Tunku Mahkota Johor or the Crown Prince of Johor in Malaysia, currently Tunku Ismail Idris Too Much Joy, American alternative rock group Total metal jacket bullet, a small-arms projectile Termez Airport, Uzbekistan, near the Afghan border (IATA code: TMJ) Samarokena language of Indonesian Papua (ISO code: tmj) WTMJ (AM), a radio station in Milwaukee, Wisconsin known casually as "TMJ" WTMJ-TV, an NBC-affiliated television station in Milwaukee, Wisconsin which utilizes the on-air branding of "TMJ4"