José Emmanuel Crescimbeni Barrantes (born June 25, 1990) is an American-born competition swimmer who has represented Peru in international events, specializing in the butterfly.

[1] He represented his parents' homeland Peru at the 2008 Summer Olympics and has currently owned Peruvian records in both the 100 and 200 m butterfly.

[2] Crescimbeni competed as Peru's lone male swimmer in the 200 m butterfly at the 2008 Summer Olympics in Beijing.

[3] He scored a ninth-place time in 2:01.09 to clear the FINA B-cut (2:01.80) at the 2007 Pan American Games in Rio de Janeiro, Brazil.

[4] Swimming in heat one, Crescimbeni held off a hard-charging Javier Hernández Maradiaga of Honduras by a tenth of a second (0.1) to snatch the third spot in 2:02.13.