Baz Luhrmann's 2001 Romeo + Juliet is based on Shakespeare's play of the same name (duh!) from 1595.
Shakespeare in Love (1998) is a semi-fictional take on the life of Shakespeare himself during the writing of Romeo and Juliet.
Seminal 2006 flick, She's the Man, is a retelling of 1601's Twelfth Night set on the soccer field and starring Amanda Bynes.
We'd love 1991's My Own Private Idaho starring River Phoenix and Keanu Reeves even if it wasn't based on Henry VI and Henry V.
Try to take your mind off Josh Harnett for two seconds and you'll realize that O from 2001 is a retelling of Othello.
Yes, 1994 animated Disney flick The Lion King is based on Hamlet, even if Disney is hesitant to admit it. Wait, but does that make Pumba Polonius?
West Side Story from 1961 is a New York-version of Romeo and Juliet, with songs, dancing, and a tragic end--though not as death-stricken as the original play.
And finally, 1998's 10 Things I Hate About You is, perhaps, the best retelling of The Taming of the Shrew ever. Yes, ever. Because nothing is better than watching Heath Ledger dance.