The Bay-class Minehunter Inshores were a class of catamaran-hull mine warfare vessels operating with the Royal Australian Navy from 1986.

Also referred to as the MHCAT (MineHunter CATamaran), the class was an attempt to produce a locally designed inshore mine warfare vessel.

The ships were built by Ramsay Fibreglass, a subsidiary of Carrington Slipways located in Tomago, New South Wales, Australia.

[6] They were constructed in a purpose-built facility and then carried by crane a short distance south to a small man-made launching basin off the Hunter River.

[3] Instead, the RAN focused on acquiring four to six coastal minesweepers (the Huon-class), and maintaining the MSAs as an as-needed inshore mine-warfare force.