Seishirō Sakurazuka (桜塚 星史郎, Sakurazuka Seishirō?) is a fictional character created by Clamp in their 1990 manga Tokyo Babylon.
In Tokyo Babylon, he appears as a kindly veterinarian engaged in a love-hate relationship with the onmyoji Subaru Sumeragi. He is also known as the Sakurazukamori, Japan’s number one assassin. The character returns in the apocalyptic manga X as a soldier in the battle of Armageddon, a Dragon of Earth.
An alternate version of the character appears in Clamp's crossover series, Tsubasa: Reservoir Chronicle.