Arlenis Sosa (born May 7, 1989 in Montecristi, Domincan Republic) is a professional fashion model. She participated in the Elite Model Look Contest in the Dominican Republic in 2006. After high school she moved to New York, and in 2008 she was signed on the spot when she walked into the office of Marilyn Models in New York. Her full name is Arlenis Sosa Peña.

She has walked the runway for Alexander Wang, Anna Sui, BCBG Max Azria, Carlos Miele, Carolina Herrera, Derek Lam, Gap, Herve Leger, Jason Wu, Jill Stuart, Jonathan Saunders, Malo, Matthew Williamson, Michael Kors, Narciso Rodríguez, Ohne Titel, Oscar de la Renta, Peter Som, Ports 1961, Rag & Bone, Ralph Lauren, Tommy Hilfiger, Zac Posen, Aquascutum, Arise African Fashion Collective, Badgley Mischka, Custo Barcelona, Diane von Furstenberg, Gottex, Hermes, Hussein Chalayan, Isaac Mizrahi, Jean Paul Gaultier, Jeremy Scott, Nathan Jenden, Nicole Farhi, Paul Smith, Roksanda Ilincic, Ruffian, and Tibi, among others. She also walked the Victoria's Secret show in 2008.

She has done campaigns for Express, Victoria's Secret, David Yurman, Topshop, Gap, and Lancome.

She has been on the cover of magazines such as Flare, i-D Magazine, Deutsch, French Revue de Modes, Mujer Única, Latina, Trace, Yo Dona, and Vogue Germany.

She has appeared in editorials for Yo Dona, Mujer Única, Flare, i-D, French Revue de Modes, Trace, Deutsch, Latina, Harper's Bazaar US, and the German, Spanish, Italian, and American editions of Vogue.

She's currently signed with Models 1 in London, Uno in Barcelona, Why Not in Milan, and with Marilyn Models in New York, and Paris.