St Mary Star of the Sea is a parish of the Roman Catholic Church in Peppermint Grove, Western Australia.

The church building is located on Stirling Highway, between McNeil and Forrest streets in Peppermint Grove, a suburb of Perth in Western Australia.

[5] The church building was built in 1904 on land donated by Dr Daniel Kenny (1860-1915).

[2] The wrought iron fence and entrance gate, also designed by Michael Cavanagh, were added in 1937.

[6] It was the second place of worship built in Peppermint Grove after St Columba's Presbyterian Church Hall, which was built on Venn Street in 1896 and later replaced by St Columba's Presbyterian Church on the corner of Venn and Keane Streets.