Robshaw has not missed a league game for Quins all season
Harlequins pair Chris Robshaw and Jordan Turner-Hall claimed the top playing honours at the 2009 Guinness Premiership awards ceremony in London.
Robshaw, Quins' all-action flanker, was named Premiership player of the year, while powerful centre Turner-Hall won the discovery of the season award.
Leicester's Richard Cockerill was named the top director of rugby.
Robshaw beat London Irish full-back Delon Armitage into second with Bath winger Joe Maddock in third.
Turner-Hall, 21, was the unanimous winner of the young player's award, with Newcastle scrum-half Micky Young in second and Leicester's Ben Youngs in third.
Harlequins missed out on a clean sweep when Tigers' boss Cockerill pipped Dean Richards to the director of rugby award.
Cockerill only took the job in November, initially on a temporary basis after Heyneke Meyer was given compassionate leave, but he succeeded in guiding Leicester to the top of the Premiership table and into the Heineken Cup final.
Richards was hailed for his efforts in Harlequins' most successful Premiership season to date, which continues with a home semi-final against London Irish.
Exiles Irish boss Toby Booth came third after guiding his side into the Premiership play-offs during his first season in charge.
Bristol may have been relegated but they did have something to cheer after winger David Lemi's brilliant solo score against Bath in September was voted try of the season.
In other awards, Saracens' Glen Jackson won the kickers' Golden Boot for the second time in three seasons, while Maddock ended as top try-scorer with 11.