1989 Nabisco Masters

{{Use mdy dates|date=August 2023}}

{{TennisEventInfo|1989|Nabisco Masters|

| date=November 27 – December 3

| edition=20th (singles) / 16th (doubles)

| category=Masters

| prize_money=$750,000

| location=New York City, United States (singles)
London, United Kingdom (doubles)

|surface= Carpet / indoor

| champs={{Flagicon|SWE}} Stefan Edberg{{cite web |title=1989 Masters – Singles draw |url=https://www.atptour.com/en/scores/archive/masters/605/1989/results |publisher=Association of Tennis Professionals (ATP)}}

| champd={{Flagicon|USA}} Jim Grabb / {{Flagicon|USA}} Patrick McEnroe{{cite web |title=1989 Masters – Doubles draw |url=https://www.atptour.com/en/scores/archive/masters/605/1989/results?matchType=doubles |publisher=Association of Tennis Professionals (ATP)}}

| after_name=ATP Tour World Championships

| main_name=ATP Finals

}}

The 1989 Masters (also known as the 1989 Nabisco Masters for sponsorship reasons){{cite book | last1 = Collins | first1 = Bud | author-link1 = Bud Collins | title = The Bud Collins History of Tennis: An Authoritative Encyclopedia and Record Book | chapter = Year-End Championships | publisher = New Chapter Press | date = October 2010 | location = New York | pages = 746 | isbn = 978-0-942257-70-0}} were men's tennis tournaments played on indoor carpet courts at Madison Square Garden in New York City, New York, United States and at the Royal Albert Hall in London, United Kingdom. It was the 20th edition of the year-end singles championships, the 16th edition of the year-end doubles championships, and both tournaments were part of the 1989 Nabisco Grand Prix. The singles championships were held in New York from November 27 through December 3, 1989, while the doubles championship were held in London from December 6 through December 10, 1989. Stefan Edberg won the singles title.