Dōkyūsei (同級生; lit. Classmates) is an erotic dating sim visual novel. Originally released in 1992 by ELF Corporation for the PC-98, it became a foundational title in the dating sim genre and spawned a video game series.

A heavily altered 1999 Windows port was the basis of a 2021 remake, which received English and Chinese releases in 2022. A Game Boy Color mahjong game with Dōkyūsei characters, Jankyusei (雀級生), was released in 2001.

Set in a fictional Japanese town during the final summer vacation before high school graduation, the player controls a male student (default name is Takurou) who has spent the first half of summer working part-time and now has four remaining weeks to create lasting memories. With no fixed linear storyline, the game unfolds across 22 in-game days divided into morning, afternoon, and evening segments, during which the protagonist explores everyday locations such as schools, parks, and city streets. Through player-driven choices, he meets, interacts with, and courts one of fourteen potential romantic partners, while contending with rival suitors and managing limited time, with each branching route culminating in a romantic outcome shaped by the player's initiative and decisions.