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Ellen Yin is a character created specifically for the Batman animated series, The Batman, as part of the DC Comics franchise. She is voiced by Ming-Na and made her debut in the episode "The Bat in the Belfry." Her name comes from Commissioner Ellen Yindel in The Dark Knight Returns.

Detective Ellen Yin is as physically adept as any male cop she knows. Ellen may be new to the Gotham beat, but she's no rookie. Previously head of her department in Metropolis, she transferred to Gotham looking for new challenges. She’s a career cop at the top of her game, true blue and by the book. Not warming to Bruce Wayne so easily, Ellen doesn't have it out personally for The Batman. It's simply cut-and-dried. As a vigilante, he's breaking the law. Not seeing past his swinging billionaire persona, she despises his seemingly silver-spoon arrogance.

When her partner and friend Ethan Bennett is transformed into Clayface, Yin loses one of her best friends in the city. Before she and The Batman parted ways when they fought Clayface, The Batman handed her a commlink, telling her to call him whenever she needed. Keeping the commlink, Yin calls The Batman her new "partner" during a coffee shop meeting with Ethan's best friend, Bruce Wayne.

Ellen Yin secretly worked with Batman and played a part in bringing in the Riddler. She was eventually found out by Chief Angel Rojas and was arrested and suspended, losing her badge. Rojas used her as bait in a trap to impress the newly appointed Commissioner Jim Gordon. Batman helped her escape and they took down the Riddler along with the Penguin and the Joker. As Rojas tried to rearrest her, Gordon, who was a Batman supporter orders Rojas to release and reinstate her, which he did. She has not reappeared since the finale of season two "Night and the City".

On "Artifacts", it is hinted that Yin became the new Commissioner of Gotham PD, in the year 2027.