Umar Sadiq Mesbah (born 2 February 1997) is a Nigerian professional footballer who plays as a forward for Serbian club Partizan, on loan from Italian club Roma. He also represents the Nigeria national under-23 team and was an important member of the squad that won a bronze medal at the 2016 Summer Olympics.
Born in Kaduna, Sadiq started playing football on the streets of his hometown at an early age. He later played for local team Kusa Boys, before joining the Future of Africa Football Academy and finally the Football College Abuja. In June 2013, Sadiq traveled with FCA to Croatia and participated at the Kvarnerska Rivijera youth tournament. He finished as the competition's top scorer and helped his team become the champions.
Following his promising performances in Croatia, Sadiq was acquired by Italian club Spezia. He failed to make any first-team appearances, but played regularly for the youth setup. In the 2014–15 season, Sadiq became the Campionato Primavera top scorer, scoring an impressive 26 goals in 24 games.