Sebastián Hernández Mejía (born 1986-10-02) is a Colombian footballer who actually plays for Deportivo Táchira. He can play as central midfielder.

He played with the Colombian U-20 national team at the 2005 South American Youth Championship, which Colombia hosted and won. He then competed at the 2005 FIFA World Youth Championship in Holland, helping Colombia to the Round of 16 before losing to eventual champion Argentina.He was a member of the 2005 Colombian Sub 20 that won the Sudamericana.

Honors
Campeonato Suramericano Sub-17
Campeonato Mundial Sub-17 (4th place)
Campeonato Suramericano Sub-20 (Colombia Campeón)
Campeonato Mundial Sub-20
Campeón Centroamericano con la Sub-20
Torneo Esperanzas de Toulon.
Colegio San Jose De La Salle.