Squadron leader (
Sqn Ldr in the RAF and
IAF;
SQNLDR in the
RAAF and
RNZAF; formerly sometimes
S/L in all services) is a
commissioned rank in the
Royal Air Force and the air forces of many countries which have historical British influence. It is also sometimes used as the English translation of an equivalent rank in countries which have a non-English air force-specific rank structure. In these cases a squadron leader ranks above
flight lieutenant and immediately below
wing commander.