Sakai may refer to:

• Sakai , an indigenous people of the Malay Peninsula
• Any of the following places in Japan
  • Sakai, Osaka, a city in Osaka Prefecture
  • Sakai, Fukui, a town in Sakai District in Fukui Prefecture
  • Sakai, Gunma, a former town in Gunma Prefecture
  • Sakai, Ibaraki, a town in Ibaraki Prefecture
  • Sakai, Nagano, a village in Nagano Prefecture
• A family name in Japan,
  • Sakai clan , a Japanese clan
  • Hiroyuki Sakai, a Japanese chef
  • Masaaki Sakai, a Japanese rock musician and television performer
  • Noriko Sakai, a J-pop star and actress
  • Saburo Sakai, a Japanese fighter ace in World War II
  • Takashi Sakai, a General of the Imperial Japanese Army in World War II

• Sakai, software project, open source educational and research software: see www.sakaiproject.org [1]