1983 Union 76 Pacific Southwest Open

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

{{TennisEventInfo|1983|Union 76 Pacific Southwest Open|

| date=April 11–17

| edition=57th

| category=Grand Prix

| prize_money=$200,000

| draw=48S / 24D

| surface=Hard / outdoor

| location=Los Angeles, California, U.S.

| venue=Los Angeles Tennis Club

| champs={{flagicon|USA}} Gene Mayer{{cite web|title=1983 Los Angeles – Singles draw|url=http://www.atptour.com/en/scores/archive/los-angeles/423/1983/draws?matchType=singles|publisher=Association of Tennis Professionals (ATP)}}

| champd={{flagicon|USA}} Peter Fleming / {{flagicon|USA}} John McEnroe{{cite web|title=1983 Los Angeles – Doubles draw|url=http://www.atptour.com/en/scores/archive/los-angeles/423/1983/draws?matchType=doubles|publisher=Association of Tennis Professionals (ATP)}}

| before_name=Pacific Southwest Open

| main_name=Los Angeles Open (tennis) {{!}} Pacific Southwest Open

}}

The 1983 Union 76 Pacific Southwest Open was a men's tennis tournament played on outdoor hard courts at the Los Angeles Tennis Club in Los Angeles, California in the United States. The event was part of the 1983 Volvo Grand Prix circuit. It was the 57th edition of the Pacific Southwest tournament and was scheduled to be held from April 11 through April 17, 1983 but due to rain the final was postponed until Monday, April 18. Second-seeded Gene Mayer won the singles title and the corresponding $36,000 first-prize money.{{cite book|title=World of Tennis 1984 : The Official Yearbook of the International Tennis Federation|year=1984|publisher=Willow Books|location=London|isbn=0002181223|pages=134–135|editor=John Barrett}}