Walter Champfleur or de Champfleur was an Irish cleric and judge of the fifteenth century, who played a leading role in Irish politics.

St. Mary's Abbey was a former Cistercian abbey located near the junction of Abbey Street and Capel Street in Dublin, Ireland. Its territory stretched from the district known as Oxmanstown down along the River Liffey until it met the sea. It also owned large estates in other parts of Ireland. It was one of several liberties that existed in Dublin since the arrival of the Anglo-Normans in the 12th century, which gave it jurisdiction over its lands.