Rei Sakai (酒井 玲, Sakai Rei, born August 9) is a Japanese voice actress affiliated with Inspion Agency. She has blood type B and her zodiacal sign is Leo.

She was born in Kanagawa Prefecture, Japan, and raised in South America (Venezuela, Chile, Brazil) and Japan, so she is trilingual and can speak Spanish, Portuguese and Japanese. She also good at English because she studied at an international school. Before being affiliated with Inspion Agency, she was affiliated with Wit Promotion (until January 2009) and Media Force (until January 2014).