The Apothecary Diaries (Japanese: 薬屋のひとりごと, Hepburn: Kusuriya no Hitorigoto) is a Japanese light novel series written by Natsu Hyūga and illustrated by Touko Shino. It has been serialized online since 2011 on the user-generated novel publishing website Shōsetsuka ni Narō.

In the following year, it was acquired by Shufunotomo, who initially published the series as a novel with a single volume in 2012, and then as a light novel series in 2014. The series is set in a fictional country modeled after ancient China.It has been adapted into two manga series in 2017, with one published by Square Enix in Monthly Big Gangan, and another one published by Shogakukan in Monthly Sunday Gene-X. The light novel is licensed digitally in North America by J-Novel Club and in print by Square Enix, and the manga illustrated by Nekokurage is also licensed by Square Enix. An anime television series adaptation produced by Toho Animation Studio and OLM premiered in October 2023. The series is set in a fictional country modelled after Ming-era China. Maomao, a young girl who works as an apothecary in the red-light district, is kidnapped and sold to the Imperial Palace as a servant. However, she still retains her curious and eccentric personality and plans to work there until her years of servitude are over, without drawing the attention of anyone. One day, after hearing the rumors that the emperor’s children are critically ill, she begins to investigate the cause, using her experience as a pharmacist, and successfully solves the mystery of their illness. Even though she intends to remain anonymous, her actions eventually catch the attention of an influential eunuch, and soon finds herself solving various mysteries in the royal court.