Tokunaga is a Japanese surname. Notable people with the surname include:
Tokunaga clan, Japanese clan
Ai Tokunaga, Japanese voice actress
Akihito Tokunaga, Japanese composer
Chinami Tokunaga, Japanese singer
Eri Tokunaga (born 1988), Japanese actress
Eri Tokunaga, Japanese politician
Hideaki Tokunaga, Japanese singer
Hisashi Tokunaga, Japanese politician
Yuhei Tokunaga, Japanese footballer