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Tsunayoshi Sawada (沢田 綱吉 Sawada Tsunayoshi?), commonly nicknamed "Tsuna" (ツナ?), is a fictional character in the anime and manga series Reborn! created by Akira Amano. In the story, Tsuna is one of the long lines of descendants from the Vongola family, a mafia that exists in Italy. He is the one who is to be the next leader of the Vongola, the tenth Vongola boss. To set him up to that position, hitman Reborn becomes his home tutor and starts training him to be a suitable boss. With Reborn's help, Tsuna starts confronting his fears and befriends with several people, with some of them becoming his guardians in the Vongola Family. However, due to Tsuna's high position in the Mafia, various other families start working to kill Tsuna which forces Tsuna and his friends to defend against their enemies. Besides the manga and the anime, Tsuna has also been featured in all of the video games from the series, light novels, and a CD soundtrack.

Tsuna's character has been very popular within readers from the manga; he appeared several time in the top 5 from the popularity polls developed for the series and has taken first place a few times. He has also been featured in merchandise from the series such as figurines and plush. Publications for manga, anime and other media have commented on Tsuna's character, adding praise and criticism. Although Tsuna's story was initially considered very simple, writers from various websites have liked Tsuna's traits as well as his growth along the manga.