Are any of Noel plays in the public domain?

Yes, some of Noël Coward's plays are in the public domain. The term of copyright protection in most countries is the life of the author plus 50 years. Coward died in 1973, so any of his works published before 1923 are now in the public domain.

Here are some of Coward's plays that are in the public domain:

- The Rat Trap (1924)

- The Vortex (1924)

- Hay Fever (1925)

- Easy Virtue (1925)

- Private Lives (1930)

It's important to note that while the text of these plays may be in the public domain, other elements such as music, designs, and adaptations may still be protected by copyright. Always check the copyright status of a work before using it.