1981 Custom Credit Australian Indoor Championships

The 1981 Custom Credit Australian Indoor Championships was a men's tennis tournament played on indoor hard courts at the Hordern Pavilion in Sydney in Australia and was part of the 1981 Volvo Grand Prix. It was the ninth edition of the tournament and was held from 12 October through 18 October 1981. Top-seeded John McEnroe won his second successive singles title at the event.

Singles
🇺🇸 John McEnroe defeated 🇺🇸 Roscoe Tanner 6–4, 7–5, 6–2
 * It was McEnroe's 10th singles title of the year and the 34th of his career.

Doubles
🇺🇸 Peter Fleming / 🇺🇸 John McEnroe defeated 🇺🇸 Sherwood Stewart / 🇺🇸 Ferdi Taygan 6–7, 7–6, 6–1
 * It was Fleming's 7th title of the year and the 39th of his career. It was McEnroe's 16th title of the year and the 72nd of his career.