Gaku (written: 岳 or 学) is a masculine Japanese given name. Notable people with the name include:
Gaku Hamada (濱田 岳) (born 1988), Japanese actor
Gaku Hasegawa (長谷川 岳) (born 1971), Japanese politician
Gaku Hashimoto (橋本 岳) (born 1974), Japanese politician
Gaku Hirasawa (平澤 岳) (born 1973), Japanese alpine skier
Gaku Homma (本間 学) (born 1950), Japanese aikidoka
Gaku Ishizaki (石崎 岳) (born 1955), Japanese politician
Gaku Konishi (小西 岳) (born 1934), Japanese physicist
Gaku Miyao (宮尾 岳) (born 1959), Japanese manga artist
Gaku Shibasaki (柴崎 岳) (born 1992), Japanese footballer
Gaku Shindo (進藤 学) (born 1980), Japanese actor and singer
