Forsterygion is a genus of triplefins in the family Tripterygiidae native to coastal New Zealand, but also introduced to Tasmania, Australia.
The name of this genus is an amalgam of Forster in honour of Johann Reinhold Forster (1729–1798) – a naturalist aboard Captain Cook’s second voyage on HMS Resolution; he collected the type on this voyage, describing it and naming it Blennius varius – and -ygion, the second part of the genus Tripterygion, into which F. varius and F. nigripenne had been placed.[3]