| Year | Title | Role | Venue | Ref. |
| 1962 | Something About a Soldier | Air Cadet / a Soldier | Ambassador Theatre, Broadway | |
| 1964 | The Last Analysis | Max | Belasco Theatre, Broadway | |
| 1965 | Barefoot in the Park | Paul Bratter | Biltmore Theatre, Broadway | |
| 1966–1968 | Don't Drink the Water | Axel Magee | Morosco Theatre, Broadway | |
| 1967–1968 | How Now, Dow Jones | Charlie | Lunt-Fontanne Theatre, Broadway | |
| 1969–1970 | Play It Again, Sam | Dick Christie | Broadhurst Theatre, Broadway | |
| 1970 | Promises, Promises | Chuck Baxter | Shubert Theatre, Broadway | |
| 1972–1973 | Sugar | Joe | Majestic Theatre, Broadway | |
| 1974–1976 | Absurd Person Singular | Geoffrey | Music Box Theatre, Broadway | |
| 1979–1981 | They're Playing Our Song | Vernon Hersch | Imperial Theatre, Broadway | |
| 1979 | Murder at the Howard Johnson's | Mitchell Lavell | John Golden Theatre, Broadway | |
| 1985–1986 | Doubles | George | Ritz Theatre, Broadway | |
| 1986–1987 | Arsenic and Old Lace | Mortimer Brewster | 46th Street Theatre, Broadway | |
| 1989–1990 | Jerome Robbins' Broadway | The Setter / Emcee / Pseudolus / Pa / Cigar / Tevye / Floy | Imperial Theatre, Broadway | |
| 1992–1993 | The Seagull | Dr. Dorn | Lyceum Theatre, Broadway | |
| 1994 | The Sisters Rosensweig | Mervyn Kant | Ethel Barrymore Theatre, Broadway | |
| 1995–1997 | Victor/Victoria | Carroll "Toddy" Todd | Marquis Theatre, Broadway | |
| 2000–2002 | The Tale of the Allergist's Wife | Ira | Ethel Barrymore Theatre, Broadway | |
| 2003–2004 | Cabaret | Herr Schultz | Studio 54, Broadway | |
| 2005 | Endgame | Hamm | Irish Repertory Theatre, Off-Broadway | |
| 2006 | Barefoot in the Park | Victor Velasco | Cort Theatre, Broadway | |
| 2007–2008 | Xanadu | Danny Maguire / Zeus | Helen Hayes Theatre, Broadway | |
| 2009 | The Royal Family | Oscar Wolfe | Samuel J. Friedman Theatre, Broadway | |