the 1925 australasian championships was a tennis tournament that took place on outdoor grass courts at the white city tennis club, sydney, australia from 24 january to 31 january. it was the 18th edition of the australian championships (now known as the australian open), the 4th held in sydney, and the first grand slam tournament of the year. the singles titles were won by australians james anderson and daphne akhurst cozens.