Chocolate Cosmos (チョコレートコスモス, Chokorēto Kosumosu) is a Japanese shōjo manga series written and illustrated by Nana Haruta. The series was serialized in Ribon magazine from the September 2007 issue of the magazine until its final chapter in the November 2008 issue. The individual chapters were collected into four tankōbon volumes by publisher Shueisha; the first on December 14, 2007, and the final on November 14, 2008.

Sayuki Sakurai is a fifteen-year-old girl who is determined to find love. On a trip to the beach she meets a handsome man who smells like chocolate and falls in love with him immediately. He tells her that he goes to her school and she is left puzzled as she has never seen him before. When she returns to school she has a surprise in the form of Hagiwara, her Home Economics teacher.

Chocolate Cosmos is written and illustrated by Nana Haruta. It was serialized in the monthly magazine Ribon from August 3, 2007, in the September issue to October 3, 2008, in the November issue. The chapters were later released in bound volumes by Shueisha for a total of 4 volumes under the Ribon Mascot Comics imprint. Viz Media licensed the manga in 2015 in English, with all four volumes published digitally under the Viz Select imprint.

The final volume of the series sold 31,326 copies in its first week, making it the 18th best-selling manga of the week.