Dinninup is a small town in the South West region of Western Australia.

It is between Boyup Brook and Kojonup.

The name was first recorded by surveyors in 1877; the meaning is unknown.

Originating as a railway station on the Boyup Brook to Kojonup line, the land was requested by early settlers to be set aside for a townsite in 1906.

The line was completed in 1910 and the Dinninup station was opened at the same time.