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K Stock
In service1927–1971
Car length50 ft (15.24 m)
Width8 ft 11+516 in (2,726 mm)
Height12 ft 3+12 in (3,746 mm)
Weight33.90 long tons (34.44 t; 37.97 short tons)
 London transport portal

London Underground K Stock is a clerestory-roofed rail stock built for the District line in 1927. It was subsequently absorbed into the London Underground Q Stock.

A complete review of District line rolling stock was carried out in 1926, leading to the withdrawal of further B Stock cars and their replacement, plus additional rolling stock to increase frequencies. This led to the construction of the K Stock, some of which was owned by the London, Midland and Scottish Railway (LMS).

As built, the cars had hand-operated sliding doors. The doors were converted to air operation in 1938 as part of the Q Stock project. The modified cars were reclassified as Q27 stock. The last of the Q Stock was withdrawn in 1971.