1986 Donnay Indoor Championships

{{TennisEventInfo|1986|Donnay Indoor Championships|

| date= 13–23 March

| edition=6th

| draw=32S / 16D

| prize_money=$250,000

| surface=Carpet / indoor

| location=Brussels, Belgium

| venue=Forest National

| champs={{flagicon|SWE}} Mats Wilander{{Cite web|url=https://www.atptour.com/en/scores/archive/brussels/406/1986/draws?matchtype=singles|title=1986 Brussels – Singles draw|publisher=Association of Tennis Professionals (ATP)}}

| champd={{flagicon|FRG}} Boris Becker / {{flagicon|YUG}} Slobodan Živojinović{{Cite web|url=https://www.atptour.com/en/scores/archive/brussels/406/1986/draws?matchtype=doubles|title=1986 Brussels – Doubles draw|publisher=Association of Tennis Professionals (ATP)}}

}}

The 1986 Donnay Indoor Championships was a men's tennis tournament played on indoor carpet courts at the Forest National in Brussels, Belgium the event was part of the 1986 Nabisco Grand Prix. It was the sixth edition of the tournament and was held from 13 March until 23 March 1986. First-seeded Mats Wilander won the singles title.{{Cite web|url=http://www.itftennis.com/procircuit/tournaments/men%27s-tournament/info.aspx?tournamentid=1010002156|archive-url=https://archive.today/20130127001359/http://www.itftennis.com/procircuit/tournaments/men's-tournament/info.aspx?tournamentid=1010002156|url-status=dead|archive-date=January 27, 2013|title=Brussels Indoor 1986|publisher=International Tennis Federation}}{{cite book|title=The International Tennis Federation : World of Tennis 1987|year=1987|publisher=Willow Books|location=London|isbn=9780002182522|pages=114–115|editor=John Barrett|editor-link=John Barrett (tennis)}}