1985 Monte Carlo Open#Doubles

{{TennisEventInfo|1985|Monte Carlo Open|

| date=1–7 April

| edition=79th

| category=Grand Prix

| draw=48S / 24D

| prize_money=$325,000

| location=Roquebrune-Cap-Martin, France

| venue=Monte Carlo Country Club

| surface=Clay / outdoor

| champs={{flagicon|TCH}} Ivan Lendl{{cite web|title=1985 Monte Carlo – Singles draw|url=https://www.atptour.com/en/scores/archive/monte-carlo/410/1985/draws?matchtype=singles|publisher=Association of Tennis Professionals (ATP)}}

| champd={{flagicon|TCH}} Pavel Složil / {{flagicon|TCH}} Tomáš Šmíd{{cite web|title=1985 Monte Carlo – Doubles draw|url=https://www.atptour.com/en/scores/archive/monte-carlo/410/1985/draws?matchtype=doubles|publisher=Association of Tennis Professionals (ATP)}}

}}

The 1985 Monte Carlo Open, also known by its sponsored name Jacomo Monte Carlo Open, was a men's tennis tournament played on outdoor clay courts at the Monte Carlo Country Club in Roquebrune-Cap-Martin, France that was part of the 1985 Nabisco Grand Prix. It was the 79th edition of the tournament and was held from 1 April until 7 April 1985. First-seeded Ivan Lendl won the singles title and earned $58,000 first-prize money. On the final Sunday he had to finish his semifinal again defending champion Henrik Sundström before defeating Mats Wilander in a {{frac|3|1|2}}-hour final.{{cite book|title=The International Tennis Federation : World of Tennis 1986|year=1986|publisher=Willow Books|location=London|isbn=9780002182096|pages=152–153|editor=John Barrett|editor-link=John Barrett (tennis)}}{{cite web |title=McEnroe winner on Connors default |url=https://www.nytimes.com/1985/04/08/sports/mcenroe-winner-on-connors-default.html |website=The New York Times |date=8 April 1985}}