The 1905 Australasian Championships was a tennis tournament played on Grass courts in Melbourne, Australia at Warehouseman's Cricket Ground.

It was the inaugural edition of the Australasian Championships and consisted of a men's singles and men's doubles competition.

The men's singles event had a field of 17 players and was won by Australian Rodney Heath.

[1][4] Rodney Heath defeated Albert Curtis, 4–6, 6–3, 6–4, 6–4 [1] Randolph Lycett / Tom Tachell defeated E.T.

Barnard / Basil Spence, 11–9, 8–6, 1–6, 4–6, 6–1 [2]