The 1908 Australasian Championships was a tennis tournament that took place on outdoor grass courts in Sydney, Australia. The preliminary rounds were played at the Sydney Cricket Ground while the final took place on the Double Bay Grounds. It was the fourth edition of the Australasian Championships (now known as the Australian Open), the first held in Sydney and the third Grand Slam tournament of the year. It consisted of a men's singles and doubles event. Fred Alexander won the singles event and became the first non-Australasian to win the title.

Finals

Singles

🇺🇸 Fred Alexander defeated 🇦🇺 Alfred Dunlop 3–6, 3–6, 6–0, 6–2, 6–3

Doubles

🇺🇸 Fred Alexander / 🇦🇺 Alfred Dunlop defeated 🇦🇺 Granville G. Sharp / 🇳🇿 Anthony Wilding 6–3, 6–2, 6–1