Josef Alexander Martínez Mencia (born 19 May 1993) is a Venezuelan professional footballer who plays as a striker for the Major League Soccer club Atlanta United FC and the Venezuela national team.
Josef Martinez began his career with Caracas. In 2012, he was acquired by the Swiss Super League club Young Boys before spending a year on loan at Thun. In 2014, he was sold to Italian club Torino, and in 2017, Major League Soccer expansion side, Atlanta United FC. He holds the MLS record for career hat-tricks with six in his first 44 games, the record for goals in a single season (31 in 2018), record for cumulative goals in regular and post season with 35 and holds the joint-record for most consecutive games with a goal (9, shared with Diego Valeri).
In 2018, Martinez became the most decorated single season player in MLS History by winning League MVP, All-Star Game MVP, Golden Boot, and MLS Cup Final Game MVP.
He is a former Venezuela under-20 international. In 2011, he made his debut for the senior Venezuela national team against El Salvador.