The blind-slide flanker, who was made Harlequins captain last summer, was picked for January by a panel made up of rugby media representatives from print, television, radio and photographers.
The Player of the Month accolade comes as a result of a number of eye-catching displays from the Quins skipper that have taken him to the cusp of the England elite squad.
Touted by many as being a future England captain, the 24-year-old has led by example this season earning such plaudits that liken him to World Cup winner Richard Hill.
Ã¢â‚¬Å“To receive the award after the likes of Thomas Waldrom and Tommy Hayes who have been so impressive for Leicester and Exeter respectively, itÃ¢â‚¬â„¢s a huge honour,” said Robshaw.
“The team have been magnificent of late and the morale around the club is sky high, itÃ¢â‚¬â„¢s a great place to be right now.Ã¢â‚¬Â
Robshaw made his Premiership debut at the London double header at the start of the 2007-08 season. He went on to be included in the England Saxons squad who won the Churchill Cup in the summer of 2008.
Following a highly successful 2008-09 campaign, Robshaw was voted Guinness Premiership Player of the Season, and earned his first England cap against Argentina during the summer tests.
Robshaw was brought into the England squad during the 2010 RBS Six Nations. His impressive form for the remainder of the season earned him a place on the 2010 summer tour to Australia where he impressed the England players and coaches when he captained England against the Australian Barbarians and the New Zealand Maori.
Harlequins director of rugby Conor OÃ¢â‚¬â„¢Shea added: “He is an outstanding player, who not only leads by example as a Captain and wants to see Quins succeed, but also wants to push on for International honours, which he so richly deserves.Ã¢â‚¬Â
MORE: The latest football news
MORE: The latest tennis news
BIOGRAPHY: Daniel Sturridge
BIOGRAPHY: Kepa Arrizabalaga