Okui (written: 奥井) is a Japanese surname. Notable people with the surname include:
- Hiroki Okui (奥井 大貴, born 1999), Japanese footballer
- Masami Okui (奥井 雅美, born 1968), Japanese singer-songwriter
- Ryo Okui (奥井 諒, born 1990), Japanese footballer
Okui (written: 奥井) is a Japanese surname. Notable people with the surname include: