Sergio Álvarez Conde, simply Sergio, is a Spanish footballer who plays for Celta de Vigo as a goalkeeper.

Sergio began his career with hometown's Arosa SC, joining Galician neighbours Celta de Vigo in 1999, aged 13. He made his senior debuts with the club's B team in the third division, playing four full seasons in the category, and spending 2008–09 on loan to another team in that level and region, Racing de Ferrol.

Sergio made his debut for Celta's first team on 4 June 2011, in a 3–0 home win against FC Cartagena, the last matchday of the second level season. Shortly after, following the starter Ismael Falcón's departure to Hércules CF, he was definitely promoted to the main squad, being awarded the #1 jersey.