Hiromasa (written: 博正, 宏昌, 弘昌, 浩正 or 大将) is a masculine Japanese given name. Notable people with the name include:
Amano Hiromasa (天野 弘昌), Japanese pastor
Hiromasa Azuma, Japanese footballer
Hiromasa Kanazawa (金澤 大将) (born 1983), Japanese footballer
Minamoto no Hiromasa (源 博雅) (918–980), Japanese noble and musician
Hiromasa Suguri (村主 博正) (born 1976), Japanese footballer
Hiromasa Tanaka (田中 宏昌) (born 1981), Japanese decathlete
Hiromasa Tokioka, Japanese footballer
Hiromasa Yamamoto (山本 浩正) (born 1979), Japanese footballer
Hiromasa Yonebayashi (米林 宏昌) (born 1973), Japanese animator and director
Hiromasa Yonekura (米倉 弘昌) (born 1937), Japanese businessman
