The discovery of two bodies in a car in the Victorian Otway Ranges on Saturday is being treated as a murder-suicide, Victoria Police say.

A jogger found the man and woman, both aged in their 20s, in a car on a dirt track off Birregurra-Forrest Road, near Forrest about 11am.

A Victoria Police spokesperson says the man was inside the sedan while the woman was in the boot.

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They say the two people are yet to be formally identified.

Detectives have appealed for anyone who saw the purple Honda Civic in the area to contact Crime Stoppers on 1800 333 000.