Hosoda was born in Kamiichi, Nakaniikawa District, Toyama, Japan. His father worked as a railway engineer, and his mother was a tailor. Hosoda initially felt inspired to take up animation as a career after seeing The Castle of Cagliostro, the first film directed by Hayao Miyazaki of Studio Ghibli fame. He majored in oil painting at the Kanazawa College of Art in Ishikawa Prefecture. After graduation, Hosoda was able to land an animation job at Toei Animation, after submitting a short film that he had animated in his spare time. He initially applied at Studio Ghibli; though he did not get the job, he received a rejection letter of praise from Hayao Miyazaki himself. During his time at Toei, Hosoda worked his way up, garnering public attention in the early 2000s with the first two films in the Digimon Adventure series. It was his first co-directed film, , which attracted the eye of Ghibli head producer Toshio Suzuki.
Studio Ghibli
Studio Ghibli announced that Hosoda was to direct the film Howl's Moving Castlein September 2001. This was scheduled for a summer 2003 release. However, production on the film became strained due to creative differences. According to Hosoda, he "was told to make similar to how Miyazaki would have made it, but wanted to make own film the way wanted to make it". In the end, Hosoda left in the summer of 2002 during the early production stages, after failing to come up with a concept acceptable to Studio Ghibli bosses.
Proceeding his departure from Ghibli, Hosoda returned to Toei and worked on a few animations in collaboration with artist Takashi Murakami, such as the commercial Superflat Monogram for Louis Vuitton. During this time, he directed an episode of Ojamajo Doremi, which was inspired by his turbulent time at Ghibli. This episode led to him being hired at the animation studio Madhouse, which he worked at from 2005 to 2011. At Madhouse, Hosoda earned critical acclaim with his directing efforts, including 2006's The Girl Who Leapt Through Time and 2009's Summer Wars.
Hosoda left Madhouse in 2011 to establish his own animation studio, Studio Chizu, with :ja:%E9%BD%8B%E8%97%A4%E5%84%AA%E4%B8%80%E9%83%8E|Yuichiro Saito who produced The Girl Who Leapt Through Time and Summer Wars. As of March 2019, Studio Chizu has released three films directed by Hosoda: 2012's Wolf Children, 2015's The Boy and the Beast, and 2018's Mirai. Mirai was nominated for Best Animated Feature for the 2019 Oscars.