Mark XIX or Mark 19 may refer to:
Military
United Kingdom
- BL 6-inch gun Mk XIX (1916–1940), an artillery piece made by Vickers
- CP Mk.XIX, a Royal Navy central-pivot twin-mount carrying two quick-firing 4-inch guns
- HA/LA Mk.XIX, a Royal Navy high-angle/low-angle twin-mount carrying two quick-firing 4-inch guns
- De Havilland Mosquito NF Mk XIX, a night fighter variant De Havilland Mosquito that could mount American or British radar
- Supermarine Spitfire Mk 19 (1944), the last and most successful Supermarine Spitfire photographic reconnaissance variant
- Vickers Wellington T Mk XIX, service conversion of the Vickers Wellington Mk X for use as a navigation trainer
- ASV Mk. 19 (anti surface vessel), an EKCO airborne radar fitted to the Royal Navy Fairey Gannet
Topics referred to by the same term