HMS E34 was a British E-class submarine built by John Thornycroft, Woolston, Hampshire.

E34 was mined near the Eijerlandse Gronden, the sands between the Frisian islands Texel and Vlieland on 20 July 1918.

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).

E34 was armed with a 12-pounder 76 mm (3.0 in) QF gun mounted forward of the conning tower.

[2] 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.