| CATHETER | Tube used in three-act play (8) |
| STERADIAN | SI unit of solid angle, used in three-dimensional geometry for objects such as spheres (9) |
| BALL | Item used in three of the Big Four sports but not hockey |
| ARABELLA | A lyric comedy or opera in three acts by Richard Strauss, which premiered in 1933 (8) |
| TURANDOT | Puccini opera in three acts (8) |
| PARSIFAL | An opera in three acts by Richard Wagner, based on a 13th Century poem about an Arthurian knight (8) |
| BLOWPIPE | A tube used in the glass industry to mould molten glass into the required shape (8) |
| AMPOULES | Small sample tubes used in chemistry (8) |
| CANNULAE | Thin tubes used in medicine |
| MAAORBARBARA | Three-act play by George Bernard Shaw, written and premiered in 1905 (5,7) |
| MAJORBARBARA | Three-act play by George Bernard Shaw, written and premiered in 1905 (5,7) |
| THEPLAYBOYOFTHEWESTERNWORLD | Three-act play by John Millington Synge that provoked riots when it opened at the Abbey Theatre, Dublin, in January 1907 |
| THEENTERTAINER | Three act play by John Osborne, first produced in 1957, whose main character is Archie Rice |
| ADOLLSHOUSE | Three-act play by Henrik Ibsen, featuring Nora and Torvald Helmer |
| TOWN | Our _, 1938 three-act play by Thornton Wilder (4) |
| LATRAVIATA | An opera in three acts by Giuseppe Verdi, first performed in Venice in 1853 (2,8) |
| DONPASQUALE | Comic opera in three acts by Donizetti, first performed in 1843 (3,8) |
| TOSCA | Opera in three acts by Puccini, first performed in 1900 (5) |
| ALBERTHERRING | A chamber opera in three acts by Benjamin Britten, first performed in 1947 (6,7) |
| TRIPLEPLAY | Drama in three acts? |
