Hosaka (written: 保坂) is a Japanese surname. Notable people with the surname include:
Brian Keith Hosaka, Filipino lawyer , Japanese Olympian and sport shooter Edward Yataro Hosaka (1907–1961), American botanist , Japanese professional wrestler , Japanese footballer , Japanese writer , Japanese basketball coach Malia Hosaka (born 1969), American professional wrestler , Japanese politician Nobuyuki Hosaka (born 1970), Japanese footballer , Japanese politician , Japanese footballer and manager