A 'major' is one of the four most prestigious professional golf events played annually.
Men
Current annual majors:
The Masters
US Open
The Open Championship
PGA Championship
Eleven Australian male golfers have won a major, they are:
5 – Peter Thomson – 1954, 1955, 1956, 1958, 1965 The Open Championship
2 – Greg Norman – 1986, 1993 The Open Championship
2 – David Graham – 1979 PGA Championship, 1981 US Open Championship
1 – Jim Ferrier – 1947 PGA Championship
1 – Kel Nagle – 1960 The Open Championship
1 – Wayne Grady – 1990 PGA Championship
1 – Ian Baker-Finch – 1991 The Open Championship
1 – Steve Elkington – 1995 PGA Championship
1 – Geoff Ogilvy – 2006 US Open
1 – Adam Scott – 2013 The Masters
1 – Jason Day – 2015 PGA Championship
Women
Current annual majors:
ANA Inspiration
LPGA Championship
U.S. Women's Open
Women's British Open
Evian Championship
Three Australian female golfers have won a major. Karrie Webb is 7th on the all-time list of most major victories.
Australian winners of a major:
1 – Hannah Green – 2019 KPMG Women's PGA
7 – Karrie Webb – 2006 Kraft Nabisco Championship, 2002 Women's British Open, 2001 US Women's Open, 2001 LPGA Championship, 2000 US Women's Open, 2000 Nabisco Championship, 1999 du Maurier Classic (previous major),
3 – Jan Stephenson – 1983 U.S. Women's Open, 1982 LPGA Championship, 1981 du Maurier Classic (previous major)