Ariel Gerardo Nahuelpán Osten (born 15 October 1987) is an Argentine professional footballer who plays as a striker for Liga 1 club PSBS Biak.

Nahuelpán had to leave football momentarily to work with his father as a bricklayer to help his family economically.

Nevertheless, he returned to football and started his career in 2006, at Nueva Chicago, playing 42 Primera B Nacional Argentina games and scoring nine goals.

Nahuelpán signed for Racing de Santander on a free transfer on 13 August 2010, to play at El Sardinero for the 2010–11 La Liga season.

Nahuelpán is of Chilean descent due to the fact that his father was born in Villarrica, Chile.