- Gender: Male
- Birthday: 1959-09-28 ( 63 years old )
- Place of Birth: Ōsaka, Ōsaka Prefecture, Japan
- Also Known As: 徳井優 / Yuu Tokui / Yū Tokui / 立原繁人 / とくい ゆう
Yu Tokui (徳井 優, Tokui Yū, real name: 徳井 利次, September 28, 1959) is a Japanese actor from Ōsaka City, Ōsaka Prefecture. He is 158 cm tall, weighs 50 kg, and has blood type A. He belongs to Takaoka Office.
In 1979, he made his movie debut in The Fixer (Nihon no Fixer) under the stage name of 立原 繁人, and changed his name to Yū Tokui in 1987.