Máel Patraic Ua Scannail or Patrick Ó Scannail (sometimes Patrick O'Scanlan) was an Irish Roman Catholic cleric. He served as Bishop of Raphoe, and later as Archbishop of Armagh and Primate of All Ireland from 1262 to 1272. 
In 1268 he laid out designs for the expansion of St. Patrick's Cathedral, Armagh (the structure now used by the Anglican  Church of Ireland). The cathedral survives substantially to his plan. 
The Annals of the Four Masters (which was compiled in the 1600s) note that in 1262, he said Mass in a pallium (in the Octave of John the Baptist), at Armagh.[1] The Annals record that in the year 1270, Archbishop O'Scannail, when he was Archbishop of Armagh, "went over to the King of England [ Edward I of England, known as Edward Longshanks]: the King received him honourably; and he returned home with great privileges".[2] 
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|  Eóin Ua GairedáinDomnall Ua GarbáinFeidlimid Ua SidaGilla in Choimded Ua CaráinMáel Ísu Ua DoirigGiovanni de AlnetoCairpre Ó ScuapaFergal Ó FirghilÉnri Mac in ChrossáinTomás Mac Carmaic Uí DomnaillPádraig Mac MaonghaillConchobhar Mac Carmaic Uí DhomhnaillSeoán Mac MeanmainEóin Mac CarmaicLochlainn Ó GallchobhairCornelius Mac Giolla BhrighdeLochlainn Ó GallchobhairMeanma Mac Carmaic
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| Abbots 8th–12th centuries
 |  Célé PetairFer dá Chrích mac SuibniCú Dínaisc mac ConasaigDub dá Leithe I mac SínaigFóendelach mac MóenaigAirechtach ua FáeláinFóendelach mac Móenaig (second)Gormgal mac DindataigCondmach mac Duib dá LeitheTorbach mac GormáinToicthech Ua TigernaigNuadu of Loch UamaFlandgus mac LoingsigArtrí mac ConchobairSuibne mac ForandáinEógan Mainistrech mac AinbthigForindán mac MurgileDiarmait ua TigernáinCathassachFéthgno mac NechtainMáel Cobo mac CrundmaílAinmere ua FáeláinMáel Cobo mac Crundmaíl (second)Cathassach mac RobartaigMáel Brigte mac TornáinIoseph mac FathaigMáel Pátraic mac Máel TuileCathassach mac DoilgénMuiredach mac FergussaDub dá Leithe II mac CellaigMuirecén mac CiaracáinMáel Muire mac EochadaAmalgaid mac Máel MuireDub dá Leithe III Máel MuireCummascach Ua hErodáinMáel Ísu mac AmalgadaDomnall mac AmalgadaCellach of ArmaghMuirchertach mac DomnallNiall mac Áeda meic Máel Ísu
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| Bishops 8th–12th centuries
 |  AffiathNuadu of Loch UamaArtrí mac ConchobairForindán mac MurgileMáel Pátraic mac FindchonFéthgno mac NechtainCathassach mac RobartaigMochtae daltae FéthgnoMáel AithginCellach mac SóergussaMáel Ciaráin mac EochocáinIoseph mac FathaigMáel Pátraic mac Máel TuileCathassach mac DoilgénCathassach mac MurchadáinMáel Muire mac ScandláinnAirmedach mac CoscraigCenn Fáelad SabaillMáel TuileÁed Ua ForréidMáel Pátraic mac AirmedaigCáenchomrac Ua BaigillMáel Coluim Ua BroicháinMáel Brigte Ua BroicháinAmlaim Ua Muirethaig
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| Archbishops 12th–16th centuries
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| Archbishops 16th–21st centuries
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| Italics indicate a person who was elected but not consecrated. | 
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