HMS E19 was an E-class submarine of the Royal Navy, commissioned in 1914 at Vickers, Barrow-in-Furness.

British E-class submarines had fuel capacities of 50 long tons (51 t) of diesel and ranges of 3,255 miles (5,238 km; 2,829 nmi) when travelling at 10 knots (19 km/h; 12 mph).

E19 was probably the first of the E-class to be fitted with a deck gun during construction, in this instance, possibly uniquely, with only a 2-pounder, forward of the conning tower.

[3] E-Class submarines had wireless systems with 1 kilowatt (1.3 hp) power ratings; in some submarines, these were later upgraded to 3 kilowatts (4.0 hp) systems by removing a midship torpedo tube.

E19 was scuttled by her crew outside Helsinki 1.5 nm south of Harmaja Light, Gulf of Finland, along with E1, E8, E9, C26, C27, and C35 to avoid seizure by advancing German forces who had landed nearby.