Nehuén Mario Paz (born 28 April 1993) is an Argentine professional footballer who plays as a defender for Bologna.
Paz's career began in 2013 with All Boys in the Argentine Primera División. He made his professional debut at the Estadio Monumental Antonio Vespucio Liberti during a defeat to River Plate on 22 September, which was the first of nineteen appearances throughout the 2013–14 season which ended with relegation. In Primera B Nacional, Paz featured sixteen times and was subsequently signed at the end of the 2014 campaign by Primera División team Newell's Old Boys. He scored his first career goal in his second start for the club, netting the opening goal in a 2–0 win against Godoy Cruz on 21 April 2015.
He remained with Newell's Old Boys for four seasons, scoring twice in fifty-seven appearances in all competitions between 2015 and 2018. On 30 January 2018, Paz joined Italian Serie A side Bologna. On 4 February, Paz was loaned back to Argentina to play for Lanús. His first appearance for Lanús arrived in a 2–1 Copa Sudamericana defeat to Sporting Cristal on 7 March.