There have been four ships of the Royal Navy name HMS Penzance, named for the port of Penzance in Cornwall. The ships motto is Diligenter Pensa (Diligent thought). The first was a frigate of 1665 The second was a frigate of 1747 The third was a sloop launched in 1930 and torpedoed and sunk in 1940 whilst on convoy protection duty by . The fourth and current is a launched in 1997 and commissioned in 1998. Royal Navy ship names