Recreational Equipment, Inc., commonly known as REI, is a privately held American retail corporation organized as a consumers' cooperative, selling outdoor recreation gear, sporting goods, and clothing via some 143 retail stores in 36 states, catalogs, and the Internet. REI's annual sales in 2014 were $2.2 billion, up 10 percent over its sales in 2013.

Rei is both a Japanese given name and a Hebrew given name.

• In Japanese, Rei can have different meanings depending on the kanji used.
• In Hebrew, the name Rei (רעי Re`iY) originates in biblical texts which mean "my shepherd; my companion; my friend".
• In Hebrew, the word 'Rei' can be used for (or by) either gender, while in Japanese, Rei is generally only a given name for females. Rei can also be used as a surname.