Morinaga (written: ) is a Japanese surname. Notable people with the surname include:
- Ai Morinaga, Japanese manga artist
- , Japanese voice actress
- Masaki Morinaga, Japanese long jumper
- , Japanese singer
- Milk Morinaga, Japanese manga artist
- Sōkō Morinaga, Rinzai Zen roshi
- , Japanese footballer
- , Japanese economist and academic
See also
- Prince Morinaga, murdered by Ashikaga Tadayoshi during the Kemmu Restoration
- Morinaga & Company, a Japanese confectionery company
- Morinaga Milk Industry, a Japanese milk products company