| Koigokoro | |
| Cover: | File:AkaneSugazakiKoigokoro.jpg |
| Type: | single |
| Artist: | Akane Sugazaki |
| Album: | Beginning |
| B-Side: | Boyfriend |
| Label: | Giza Studio |
| Prev Title: | Kimi no Namae Yobu dakede |
| Prev Year: | 2002 |
is a song by Japanese singer Akane Sugazaki. It was released on 28 May 2003 through Giza Studio, as the third single from her debut studio album Beginning (2003). The song reached number thirty-eight in Japan and has sold over 7,389 copies nationwide.[1] The song served as the theme song to the Japanese anime television series, Detective School Q.
|-! scope="row"| Japan (RIAJ)| | 7,389|-|}