1975 Custom Credit Australian Indoor Championships

The 1975 Custom Credit Australian Indoor Championships was a men's professional tennis tournament played on indoor hard courts at the Hordern Pavilion in Sydney, Australia and was part of the 1975 Commercial Union Assurance Grand Prix as a Group AA category event. The tournament was held from 13 October through 19 October 1975. Unseeded Stan Smith won the singles title.

Singles
🇺🇸 Stan Smith defeated 🇺🇸 Robert Lutz 7–6, 6–2
 * It was Smith's 6th title of the year and the 55th of his career.

Doubles
🇺🇸 Brian Gottfried / 🇲🇽 Raúl Ramírez defeated 🇦🇺 Ross Case / 🇦🇺 Geoff Masters 6–4, 6–2
 * It was Gottfried's 13th title of the year and the 21st of his career. It was Ramírez's 15th title of the year and the 24th of his career.