Robert "Bill" William Henderson MLC RMN (born 28 December 1961) is a Manx legislator who, after winning a 1998 by-election, represented the constituency of Douglas North in the House of Keys, the directly elected lower branch of Tynwald, the Isle of Man's parliament. In 2010, he was elected to the upper house, the Legislative Council; he was re-elected in 2015 and again in 2020.