Dame Maggie Smith as Headmistress Minerva McGonagall.

Norman Reedus as Deputy Headmaster Daryl Smith.

Skeet Ulrich as Head of Gryffindor Billy Jones.

Sarah Hyland as Head of Hufflepuff Katy Una Johnson.

Warwick Davies as Head of Ravenclaw Filius Flitwick

Jim Broadbent as Head of Slytherin Horace Slughorn

Zoë Wanamaker as Flying Instructor and Referee, Madam Rolanda Hooch.

Sean Biggerstaff as Oliver Wood. Flying Assistant and Quidditch Coach (for all Houses).

Gwyneth Paltrow as Potions Professor Charity Zoe Platt. Years 1-4.

Alan Rickman as Potions Professor Severus Snape. Years 5-7.

Adelomiwa Edwn as Transfiguration Professor Tony Cox.

Miriam Margolyes as Herbology Professor Pomona Sprout

Colton Haynes as Muggle Studies Professor Ted Tonks

Ashleigh Murray as Ancient Runes Professor Bathsheda Babbling

Dichen Lachman as Arithmancy Professor Septima Vector