Crocodile tears are a false or insincere display of emotion such as a hypocrite crying fake tears of grief. The expression comes from an ancient anecdote that crocodiles weep in order to lure their prey, or that they cry for the victims they are eating. This tale was first spread widely in English in the stories of the travels of Sir John Mandeville in the 14th century.

An alternate explanation for the expression's origin is that crocodile tears cannot be authentic because crocodiles cannot cry; they lack tear ducts. Yet this is a myth: Crocodiles possess lacrimal glands which secrete a proteinaceous fluid, just like in humans, though tears will only be visible after a crocodile is out of the water for a prolonged period of time, and the eyes begin to dry out. However, while crocodiles can and do generate tears, they do not actually cry.

One prominent use of the expression is by Shakespeare in Othello Act IV, Scene i

If that the earth could teem with woman's tears,

Each drop she falls would prove a crocodile.

Out of my sight!

Again, Shakespeare, in an earlier play, Henry VI, part 2, Act III, Scene i

Beguiles him as the mournful crocodile

With sorrow, snares relenting passengers;

The crocodile tears syndrome is an uncommon consequence of recovery from Bell's palsy where faulty regeneration of the facial nerve causes sufferers to shed tears while eating.