Yūsaku, Yusaku or Yuusaku (written: 優作, 勇作, 雄策, 有作, 友作, 裕策 or 祐作) is a masculine Japanese given name. Notable people with the name include:
Yūsaku Igarashi (五十嵐 雄策), Japanese writer
Yusaku Iriki (入来 祐作, born 1972), Japanese baseball player
Yusaku Kuwazuru (桑水流 裕策, born 1985), Japanese rugby union player
Yusaku Maezawa (前澤 友作, born 1977), Japanese businessman
Yūsaku Matsuda (松田 優作, 1949–1989), Japanese actor
Yūsaku Miyazato (宮里 優作, born 1980), Japanese golfer
Yusaku Tanioku (谷奥 優作, born 1978), Japanese footballer
Uehara Yūsaku (上原 勇作, 1856–1933), Japanese general
Yusaku Ueno (上野 優作, born 1973), Japanese footballer
Yusaku Yara (屋良 有作, born 1948), Japanese actor and voice actor
