| Year | Title | Role | Notes |
| 1979 | Hamlet | Hamlet | - |
| 1980 | The Suicide | Semyon Semyonovich Podsekalnikov | Nominated—Drama Desk Award for Outstanding Actor in a Play |
| 1982–1985 | Much Ado About Nothing | Signior Benedick of Padua | Tony Award for Best Actor in a Play Nominated—Drama Desk Award for Outstanding Actor in a Play |
| 1983–1985 | Cyrano de Bergerac | Cyrano de Bergerac | Critics Circle Theatre Award Best Actor Laurence Olivier Award for Actor of the Year in a Revival Nominated—Drama Desk Award for Outstanding Actor in a Play |
| 1986–1988 | Breaking the Code | Alan Turing | Nominated—Drama Desk Award for Outstanding Actor in a Play Nominated—Laurence Olivier Award for Best Actor Nominated—Tony Award for Best Actor in a Play |
| 2000 | Uncle Vanya | Ivan Petrovich Voinitsky | Nominated—Drama Desk Award for Outstanding Actor in a Play |
| 2009 | Twelfth Night | Malvolio | Laurence Olivier Award for Best Actor |
| 2010 | King Lear | King Lear | - |
| 2016 | Romeo and Juliet | Mercutio | - |