1974 Commercial Union Assurance Masters

{{Use dmy dates|date=December 2023}}

{{TennisEventInfo|1974|Commercial Union Assurance Masters|

| date=10–15 December

| edition=5th

| category=Masters

| draw=8S

| prize_money=$100,000

| surface=Grass / outdoor

| location=Melbourne, Australia

| champs={{flagicon|ARG}} Guillermo Vilas{{cite web |title=1974 Masters Melbourne – Draw |url=https://www.atptour.com/en/scores/archive/masters/605/1974/results |publisher=Association of Tennis Professionals (ATP)}}

| main_name=ATP Finals

}}

The 1974 Masters (also known as the 1974 Commercial Union Assurance Masters for sponsorship reasons){{cite book | last1 = Collins | first1 = Bud | authorlink1 = 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}} was a men's tennis tournament played on outdoor grass courts in Kooyong, Melbourne in Australia. It was the fifth edition of the Masters Grand Prix and was held from 10 December through 15 December 1974. Guillermo Vilas won the title.