| Carlos Cestero | Proteus | |
| Stockard Channing | Julia | |
| Christopher Cox | Citizen of Verona and Milan | |
| Sheila Gibbs | Lucetta | |
| La Lupe | Julia | Was replaced in previews |
| Wendy Mansfield | Citizen of Verona and Milan | |
| Larry Marshall | Valentine | |
| Taro Meyer | Citizen of Verona and Milan | |
| Joe Morton | Valentine | |
| M.J. Quinn | Citizen of Verona and Milan | |
| Buena Rivera | Citizen of Verona and Milan | |
| Chris Sarandon | Proteus | |
| David Thomas | ||
| Chesley Uxbridge | Thurio | |
| Arnetia Walker | Citizen of Verona and Milan | |
| Elwoodson Williamson | Duke of Milan | |
| Hattie Winston | Silvia | |
| Samuel E. Wright | Valentine |