The Dirty Duck (also known as The Duck, Woolsthorpe) is a campsite attached to a pub and restaurant in the village of Woolsthorpe by Belvoir, Lincolnshire. It sits on the banks of the Grantham Canal, with views toward Belvoir Castle.

The site offers both grass and hardstanding pitches, along with shower and toilet facilities. It serves as a convenient base for exploring Belvoir Castle and the surrounding Lincolnshire countryside.

The adjacent pub, trading since 1749, provides cask ales, craft beers, and an à la carte menu of pub classics.