Julio Alonso Sosa (born 14 December 1998) is a Spanish professional footballer who plays as a left back for CD Mirandés.
[1] He made his senior debut with the reserves on 27 August 2017, coming on as a second-half substitute for Redru in a 4–1 Segunda División B away loss against Real Balompédica Linense.
Alonso immediately became a regular starter for the B-team, suffering relegation to Tercera División in his first season but achieving promotion back in his third; he scored his first senior goal for the side on 29 September 2019, netting the B's third in a 4–1 away routing of Córdoba CF B.
On 17 June 2021, he signed a two-year contract with Albacete Balompié, freshly relegated to Primera División RFEF.
[2] A first-choice for Alba as the club returned to Segunda División at first attempt, Alonso made his professional debut on 15 August 2022, starting in a 2–1 away win against CD Lugo.