Anthony "Anto" Drennan (born on 1 November 1958) is an Irish guitarist and bassist noted for his involvement with the Corrs, Moya Brennan, Genesis and Mike + the Mechanics.

Drennan is from a musical Irish family and was born in Luton, England; he and his family moved back to Ireland while he was at a young age. He grew up in County Dublin and attended Kilmacud National School.

Drennan became a touring lead guitarist for the Corrs from late 1995 and onwards. He was chosen as the touring second lead guitarist/bassist for Genesis on their 1998 Calling All Stations tour (replacing long-time live band member Daryl Stuermer). In 2010, he was hired as the lead guitarist and secondary bassist of the revived Mike + the Mechanics. He has also played with Clannad, Paul Brady, Moving Hearts, Chris Rea, Davy Spillane, the Liffey Light Orchestra, and the Ronnie Drew Band.

"Anthony Drennan appearances". AllMusic. Retrieved 9 December 2010.