HMS Diligent (1781) was a schooner of eight guns that served between 1781 and 1790.
HMS Diligent (1790) was a schooner of four guns purchased locally in 1790 for the Halfax station, decommissioned in 1795, and converted to harbour duties.
HMS Diligent was the storeship HMS Porpoise, renamed HMS Diligent in 1799 and sold in 1802.
HMS Diligente was a French corvette of 12 guns that HMS Crescent captured in the Antilles in 1800. The Royal Navy took her into service as a 14-gun transport and sold her in 1814.
HMS Diligent (1806) was a French brig-sloop of 16 guns that HMS Renard captured in the West Indies in 1806. The Navy renamed her Prudente in 1806, and Wolf in 1807. She was broken up in 1811.
HMS Diligente was a French patrol boat launched at Brest in 1916 that served the Royal Navy during World War II as a depot ship for auxiliary patrol craft.
^"Naval & Military intelligence". The Times. No. 36980. London. 17 January 1903. p. 9.