Cellach

Cellach (hypocoristic Cellachán) is an Irish name. It might refer to:


 * Cellach of Killala (fl. mid-6th century), supposed first Bishop of Killala in Ireland
 * Cellach I of Cennrígmonaid, a 9th/10th-century bishop
 * Cellach II of Cennrígmonaid, a 10th-century bishop
 * Cellach mac Máele Coba, a 7th-century High King of Ireland
 * Cellach mac Fáelchair, king of Osraige
 * Cellach mac Rogallaig (d. 705), a king of Connacht
 * Cellach Cualann, a 7th/8th-century king of Leinster
 * Cellach mac Dúnchada, king of Leinster
 * Cellach mac Brain, king of Leinster
 * Cellach mac Faelan, king of Leinster
 * Cellachán Caisil, a 10th-century king of Munster
 * Cellach húa Rúanada, Irish poet (d. 1079, Annals of Ulster)
 * Saint Cellach, 11th/12th-century bishop of Armagh
 * Saint Ceallach, hermit of Glendalough
 * Ceallach Spellman (b. 1995), English actor, TV and radio host