Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport
Aircraft
Right after takeoff; received Smoke: Mid Cabin Master Warning indication.  Switched to Departure and informed of a smoke situation. Stopped climb at 2;000 feet; turned to north to set up for a landing.  We were given [another runway] as an option and decided to do that instead.  Ran minimum check list and landed.  Stopped straight ahead on the runway. Had Crash; Fire; and Rescue (CFR) do a thermal check. After getting the all clear; taxied to gate.
[Report narrative contained no additional information.]
An A300 flight crew reported returning to departure airport after receiving a Master Warning for Smoke.