A321
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
Departed ZZZ. On climb out through FL200; First Officer noticed odor. Seconds later; Flight Attendant called and reported odor in the cabin. First Officer and Captain donned O2 masks; [advised ATC]; and returned to ZZZ. Cause [was] APU oil leak.
A321 Captain reported executing an air return due to odor during initial climb. Captain suspected odor caused by APU oil leak.