Eddie Redmayne as Stephen Hawking

Felicity Jones as Jane Hawking

Charlie Cox as Jonathan Hellyer Jones

Emily Watson as Beryl Wilde

Simon McBurney as Frank Hawking

David Thewlis as Dennis Sciama

Maxine Peake as Elaine Mason

Harry Lloyd as Brian

Tom Prior as Robert Hawking (Age 17)

Sophie Perry as Lucy Hawking (Age 14)

Finlay Wright-Stephens as Timothy Hawking (Age 8)

Alice Orr-Ewing as Diana King

Thomas Morrison as Carter

Michael Marcus as Ellis

Gruffudd Glyn as Rees

Paul Longley as Barman - Rowing Club

Guy Oliver-Watts as George Wilde

Lucy Chappell as Mary Hawking

Charlotte Hope as Philippa Hawking

Abigail Cruttenden as Isobel Hawking

Nicholas Gerard-Martin as Physicist #1

Brett Brown as Physicist #2

Anthony Skrimshire as Physicist #3

Christian McKay as Roger Penrose

Adam Godley as Senior Doctor - Cambridge Hospital

Nicola Sloane as Bedder

Lottie Hamilton as Robert Hawking (New Born)

Enzo Cilenti as Kip Thorne

Rufus Taylor as Robert Hawking (Age 2)

Delilah Sexton as Lucy Hawking (New Born)

Eileen Davies as Eileen Bond

Simon Chandler as John Taylor

Georg Nikoloff as Khalatnikov

Oliver Payne as Robert Hawking (Age 8)

Raffiella Chapman as Lucy Hawking (Age 6)

Sam Houston as Timothy Hawking (Baby)

Victoria Emslie as Sarah (Geneva Student)

Frank Lebœuf as Swiss Doctor

Will Barton as Technician

Lucy Challenger as Female Fan

Nicola Victoria Buck as Cockcroft Guest #2

Stuart Benson as Cockcroft Guest #3

Andrew Bridgmont as Cockcroft Guest #5

Jamie Edwards as Cockcroft Guest #4

Jumaane Brown as Cockcroft Guest #1

Becky Bush as Undergraduate (uncredited)

Jon Wennington as Journalist (uncredited)