The Diary of a Teenage Girl is a 2015 American comedy-drama film written and directed by Marielle Heller, based on the hybrid novel of the same name by Phoebe Gloeckner.

It also stars Kristen Wiig, Alexander Skarsgård, Christopher Meloni, Quinn Nagle, and Austin Lyon.

Charlotte loses her job as a librarian, so Minnie and her younger sister Gretel ask Pascal for money, and though he is irritated, he sends the family a check.

After they have sex and take acid together, Minnie sees herself covered in feathers and flying, but Monroe has a bad trip, convinced they are being watched.

Writer and director Heller received Phoebe Gloeckner's graphic novel The Diary of a Teenage Girl as a Christmas gift from her younger sister in 2007.

[7] Gloeckner gave her consent to Heller's stage adaptation after attending a read-through, saying "[Marielle] created something so moving, and it was the first time I had seen the characters in three dimensions.

[8] The Diary of a Teenage Girl play premiered at 3LD Arts and Technology Center, produced by Aaron Louis in association with New Georges and The Essentials.

[8] The production design functioned as an immersive theatrical experience with a carpeted sunken living room and pillows for the audience to sit on, and video and actors' actions took place in a full surround environment.

[6][7] On January 10, 2014, Kristen Wiig, Alexander Skarsgård, and Bel Powley were reported to have joined the cast of the film as leads.

[16] Shortly after, it was announced Sony Pictures Classics had acquired distribution rights to the film in North and Latin America, Australia, New Zealand, Eastern Europe excluding Russia, Asia, Scandinavia, Germany and Austria.

The website's critics consensus reads: "Boldly unconventional and refreshingly honest, Diary of a Teenage Girl is a frank coming-of-age story that addresses its themes—and its protagonist—without judgment.

"[20] The Guardian gave it five out of five stars and called it "morally complex and sometimes uncomfortably close to the bone, but also lushly bawdy and funny, and packaged together with an astonishing degree of cinematic brio.

"[21] Emily St. James of Vox praised the movie for being "quietly radical", describing it as "a story of huge emotions and big moments, told via intimate gestures and tiny power shifts".