Suggestions by @bluemoon

Sean Harris

as Fenrir Greyback in Harry Potter: The Limited Series

Nathaniel Parker

as Marvolo Gaunt in Harry Potter: The Limited Series

Philip Jackson

as Kreacher (voice) in Harry Potter: The Limited Series

Russell Tovey

as Dobby (voice) in Harry Potter: The Limited Series

Terence Stamp

as Aberforth Dumbledore in Harry Potter: The Limited Series

Sheridan Smith

as Winky (voice) in Harry Potter: The Limited Series

Freema Agyeman

as Narcissa Malfoy in Harry Potter: The Limited Series

Sean Bean

as Alastor Moody in Harry Potter: The Limited Series

Liam Neeson

as Alastor Moody in Harry Potter: The Limited Series

Juliet Stevenson

as Sybill Trelawney in Harry Potter: The Limited Series

Mark Rylance

as Albus Dumbledore in Harry Potter: The Limited Series

John Lynch (DC)

as Rubeus Hagrid in Harry Potter: The Limited Series

Mackenzie Crook

as Mundungus Fletcher in Harry Potter: The Limited Series

Mark Strong

as Barty Crouch Sr. in Harry Potter: The Limited Series

Lee Mack

as Peeves (voice) in Harry Potter: The Limited Series

Richard Armitage

as Sirius Black in Harry Potter (Perfect Casting)

Aidan Turner

as Sirius Black in Harry Potter (Perfect Casting)

Cillian Murphy

as Lucius Malfoy in Harry Potter: The Limited Series

Aneurin Barnard

as Severus Snape in Harry Potter: The Limited Series

Michelle Duncan

as Grey Lady in Harry Potter: The Limited Series