Ecgfrith (died December 796) was a King of Mercia who briefly ruled in the year 796. He was the son and heir of King Offa of Mercia, and in 787, Offa had Ecgfrith crowned as co-ruler. He succeeded his father in July 796, but despite Offa's efforts to secure his son's succession, it is recorded that Ecgfrith ruled for only 141 days. Since Offa died either on July 26 or July 29, this would mean that Ecgfrith died either on December 14 or December 17.

Preceded by: Offa

King of Mercia

Succeeded by: Coenwulf