When writing an MLA essay do you underline the title of a play?

In MLA format, you italicize the title of a play, not underline it.

Here's a breakdown:

* Italicize: *Hamlet*, *A Streetcar Named Desire*, *The Importance of Being Earnest*

* Do not underline: Hamlet, A Streetcar Named Desire, The Importance of Being Earnest

This applies to both in-text citations and your Works Cited page.