Mark XIX or Mark 19 often refers to the 19th version of a product, frequently military hardware. "Mark", meaning "model" or "variant", can be abbreviated "Mk."

Mark XIX or Mark 19 can specifically refer to:

[edit] In military and weaponry

• BL 6 inch Gun Mk XIX (1916-1940); a British artillery piece made by Vickers
• CP Mk.XIX; a Royal Navy central-pivot twin-mount carrying two quick-firing 4 in guns
• HA/LA Mk.XIX; a Royal Navy High Angle / Low Angle twin-mount carrying two quick-firing 4 in guns
• De Havilland Mosquito NF Mk XIX; night fighter variant that could mount American or British radar, an improved version of the NF Mk XIII
• Supermarine Spitfire Mk 19 (1944); the last and most successful Spitfire photographic reconnaissance variant
• Vickers Wellington T Mk XIX; service conversion of the Wellington Mk X for use as a navigation trainer
• Desert Eagle, also known as Mark XIX (1982); an American large caliber semi-automatic pistol
• Logistics Vehicle System MK19 Rear Body Unit; US Marine Corps heavy tactical vehicle trailer incorporating a crane
• Mk 19 grenade launcher; a widely-used American belt-fed weapon that fires 40 mm grenades

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