Smith gained her fifth Best Actress award for her performance as Goebbels's secretary in A German Life, pipping Hayley Atwell, Cecilia Noble, Juliet Stevenson and Anjana Vasan to the post.
The ceremony, which was held at the London Coliseum, was hosted by the owner of the Evening Standard, Evgeny Lebedev, with co-hosts Anna Wintour, Damian Lewis, Helen McCrory and Cush Jumbo.
Awards were presented by Olivia Colman, Naomi Scott, Lashana Lynch, Taron Egerton and Ruth Wilson, among other industry figures.
Read the full list of winners below...
Andrew Scott for Present Laughter at the Old Vic
Maggie Smith for A German Life at the Bridge
Sweat by Lynn Nottage at the Donmar Warehouse & Gielgud
Robert Icke for The Doctor & The Wild Duck at the Almeida
Evita at the Regent’s Park Open Air Theatre
Best Musical Performance
Anne-Marie Duff for Sweet Charity at the Donmar Warehouse
Bunny Christie for A Midsummer Night’s Dream at the Bridge
Most Promising Playwright
Jasmine Lee-Jones for seven methods of killing kylie jenner at the Royal Court
Laurie Kynaston for The Son at the Kiln & Duke of York’s
Sir Ian McKellen for his On Stage tour
Peter Brook for his contribution to theatre
Join our new commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies