Seven ships of the Royal Navy have been named HMS Monmouth. Monmouth was the name of a castle and is now the name of a town in Wales; the name also recognises James Scott, 1st Duke of Monmouth, the "Black Duke".

was an 8-gun yacht launched in 1666 and sold in 1698. was a 66-gun third rate launched in 1667. She was rebuilt in 1700 and 1742, and was broken up in 1767. was a 64-gun third rate launched in 1772. She became a prison ship and named HMS Captivity in 1796, and was broken up in 1818. was a 64-gun third rate, originally the Indiaman Belmont. She was purchased on the stocks and launched in 1796. She became a sheer hulk in 1815 and was broken up in 1834. HMS Monmouth was a 46-gun fifth rate launched in 1828 as . She became a chapel hulk in 1859, was renamed HMS Monmouth in 1868, and sold in 1902. was a armoured cruiser launched in 1901 and sunk at the Battle of Coronel in 1914. was a Type 23 frigate launched in 1991 and decommissioned in 2021. She was sold for scrapping in 2025.

Battle honours Ships named Monmouth have earned the following battle honours:

Sole Bay 1672 Texel 1673 Barfleur 1692 Vigo 1702 Gibraltar 1704 Velez Malaga 1704 Marbella 1705 Finisterre 1747 Ushant 1747 Foudroyant 1758 Belle Isle 1761 Sadras 1782 Providien 1782 Negapatam 1782 Trincomalee 1782 Camperdown 1797 Egypt 1801

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