The 1990 Holden NSW Open (known as such in 1990 for sponsorship reasons) was a combined men's and women's tennis tournament played on outdoor hard courts. It was the 98th edition (the 22nd edition in the Open Era) of the event known that year as the Holden New South Wales (NSW) Open, and was part of the ATP World Series of the 1990 ATP Tour, and the WTA Tier III tournaments of the 1990 WTA Tour. It took place at the White City Stadium in Sydney, Australia, from 8 to 14 January 1990. Yannick Noah and Natasha Zvereva won the singles titles.