when do we find out who a is on pretty little liars

You first find out who “A” is in the season 2 finale , episode 25, titled “UnmAsked,” when Mona is revealed as the original “A.” Later in the series, the show does bigger “A” reveals again, most notably in season 6, episode 10 (“Game Over, Charles”), when CeCe/Charlotte is revealed as the so‑called “Big A.”

When “A” Is Revealed

• Original “A” (Mona): Revealed in Pretty Little Liars season 2, episode 25, “UnmAsked.”

• Big A (CeCe/Charlotte): Revealed in season 6, episode 10, “Game Over, Charles,” which was promoted as the episode where the Liars finally uncover the “real” A’s identity.

• The show also introduces later versions (like A.D./Uber A) toward the very end of the series, extending the mystery beyond the first big reveal.

Quick Scoop

For most fans asking “when do we find out who A is on Pretty Little Liars,” the key milestone is that first reveal in the season 2 finale, which answers the original stalker mystery while still leaving room for the bigger A game that continues through seasons 3–7.