Shōshimin Series (Japanese: 〈小市民〉シリーズ, Hepburn: (Shōshimin) Shirīzu; lit. '⟨Small Citizen⟩ Series') is a Japanese mystery novel series written by Honobu Yonezawa. The series began publication by Tokyo Sogensha in December 2004, with six volumes being released as of April 2024. A manga adaptation of the first novel was serialized in Square Enix's shōnen manga magazine Monthly GFantasy from April 2007 to December 2008. A manga adaptation of the second novel was serialized in Monthly GFantasy from February 2010 to January 2011. An anime television series adaptation of the first and second novel, produced by Lapin Track, aired from July to September 2024. A second season, adapting the third and fifth novels, aired from April to June 2025.

Jōgorō Kobato and Yuki Osanai are two friends who go to Funato High School. Before entering high school, the two vowed to live ordinary lives. However, this proves difficult as mysterious incidents and encounters take place at school and their town. Despite their initial pledge, the two find themselves becoming involved, with Jōgorō's interest in detective work leading him to investigate these events.