The plaque, which was spotted over the weekend, says: "The members of Muirfield Golf Club are hereby excluded from sitting on this bench. By the order of the female population."
A post featuring a picture of the plaque on Facebook has been shared nearly 2000 times and liked by 8000 people. On Twitter, the picture was retweeted almost a thousand times by Monday morning.
Facebook comments range from people wholeheartedly agreeing with the sentiments of the plaque - to others branding it sexist.
Jason Davis wrote: "Why can't men have a men-only club? Why do women feel the need to protest and force their way in?
"There are many, many women only clubs (including golf clubs) and these don't make headlines.
"Sometimes men want a space away from women, as women do away from men. Doesn't mean its sexist or a bad thing!"
Gil Thomson wrote: "A not unreasonable request as the 'female population of Edinburgh' have obviously paid for the bench.
"However as the 'gentleman members of Muirfield Golf Club' started the club and have been responsible for its upkeep throughout the years is it unreasonable for them to decide who should play on their course?"
But another Facebook user, David Rees, said: "They define their club as 'the home of honourable golfers'? Guess they have had an irony bypass, in the belief that irons are male? Bet if he were around today Tommy Morris would have shaken the old farts up."
And Fiona Grant wrote: "This is QUALITY. Hope its real! Get in ladies!!"
Stuart G McEwen, secretary of The Honourable Company of Edinburgh Golfers, said the club did not want to comment.
This article was originally published by the Daily Telegraph UK