Through the Looking-Glass, and What Alice Found There (also known as Alice Through the Looking-Glass or simply Through the Looking-Glass) is an 1871 novel by Lewis Carroll and the sequel to Alice's Adventures in Wonderland (1865). Alice again enters a fantastical world, this time by climbing through a mirror into the world that she can see beyond it. There she finds that, just like a reflection, everything is reversed, including logic (e.g. running helps you remain stationary, walking away from something brings you towards it, chessmen are alive, nursery rhyme characters exist, etc.).

Through the Looking-Glass includes such verses as "Jabberwocky" and "The Walrus and the Carpenter", and the episode involving Tweedledum and Tweedledee. The mirror which inspired Carroll remains displayed in Charlton Kings, Gloucestershire.

It was the first of the "Alice" stories to gain widespread popularity, and prompted a newfound appreciation for its predecessor when it was published.