Robert Samuel Kiernan (born 13 January 1991) is a professional footballer who plays as a defender for English League One club Southend United.
Kiernan has previously played for Watford, Wigan Athletic and Rangers, and has also spent time on loan at Kilmarnock, Yeovil Town, Bradford City, Wycombe Wanderers, Accrington Stanley, Burton Albion, Brentford, Southend United and Birmingham City.
Kiernan, who was born in Hertfordshire, played for the Republic of Ireland at youth levels up to and including under-21.