The American Institute of Irish Archaeology, an independent research institute affiliated with Saint Louis University, is a 501c3 not for profit in the State of Missouri organized to advance the study of Irish archaeology in the United States. AIIA sponsors ongoing research medieval Gaelic settlement in north County Roscommon, where the Institute began field work in 2004 at Kilteasheen.
Affiliated faculty hold positions at Saint Louis University, Washington University in Saint Louis, IT-Sligo, the University of Indiana, and National University of Ireland-Galway.
The Institute sponsors a summer field school hosted at the Riverhaven lodges near Knockvicar, Co. Roscommon. This years research will focus on gathering data regarding agricultural land usage in the medieval lordship of Moylurg.