Donald Marland Hewlett (30 August 1920 – 4 June 2011)[2] was an English actor who was best known for his sitcom roles as Colonel Charles Reynolds in It Ain't Half Hot Mum and Lord Meldrum in You Rang, M'Lord?, both written by Jimmy Perry and David Croft.

[4] Following his demob, rather than return to Cambridge University, Hewlett trained at RADA and gained his first professional acting job in repertory theatre at the Oxford Playhouse where he suggested the management should cast Ronnie Barker in his first, small, role.

[10] However, he gained his most prominent role in the Croft and Perry sitcom It Ain't Half Hot Mum (1974–81) as Colonel Charles Reynolds.

[3] He was cast with Michael Knowles in another David Croft sitcom, the sci-fi parody Come Back Mrs. Noah (1977–78), and later with the successful You Rang, M'Lord?

[17] Hewlett made a number of film appearances including Spike Milligan's Adolf Hitler - My Part in His Downfall, A Touch of Class, Carry On Behind and The First Great Train Robbery.