Eleri (the Welsh form of the masculine given name Hilarus or Hilarius) may refer to:
Pope Hilarius (5th century) in Welsh contexts
Eleri, daughter of Brychan Brycheiniog, the Welsh, 5th-century king
Saint Eleri (7th century), Welsh prince and abbot, cousin of Saint Winifred
Eleri Cousins (born 1987), archaeologist and Lecturer in Roman History at the University of Lancaster Eleri Earnshaw (born 1985), Welsh footballer Eleri Mills (born 1955), Welsh painter Eleri Morgan (comedian), Welsh comedian and actress Eleri Rees (née Morgan; born 1953), Welsh judge Eleri Siôn (born 1971), Welsh radio and television host Sian Eleri, Welsh radio presenter