Tuilleadh feasa ar Éirinn óigh ("More knowledge on the entirety of Ireland") is a medieval Gaelic-Irish topographical text, composed by Giolla na Naomh Ó hUidhrín (died 1420).
Tuilleadh feasa ... is both a supplement and a continuation of Seán Mór Ó Dubhagáin's Triallam timcheall na Fodla.
Of the two, James Carney wrote: