Maelan mac Cathmogha (died 848) was King of Maigh Seóla.
Maelan appears to be one of the earliest recorded kings of the territory of Maigh Seola, later known as Uí Briúin Seóla.
Magh Seola was surrounded to the east by the Soghain and the Uí Maine; to the south Conmaicne Máenmaige and the Uí Fiachrach Aidhne; to the west by the Delbhna Tir Dha Locha; to the north and far north-west, the Conmhaícne.
Some occurred in Connacht: During one such episode in 848, Maelan was slain by the foreigners.
He is anachronistically referred to as lord of Ui Briuin of South Connaught.