Jacobus Ó Cethernaig, aka James O'Kearney was Bishop of Annaghdown during 1323 - 1324 and Bishop of Connor during 1324 - 1351.
Ó Cethernaig wa appointed to Annaghdown on 16 December 1323 but was translated from Connor between 7 and 15 May 1324. He received possession of the temporalities on 22 December 1324. He died 1351. He was a native of either County Galway or County Mayo.