The Irish Distributive and Administrative Union (IDATU) was a trade union representing workers in Ireland. The union was founded in 1901 as the Irish Drapers' Assistants' Association by Michael O'Lehane. O'Lehane had been working at Cannocks in Limerick where several female shop workers living on the premises died in a major fire. O'Lehane relocated to Dublin, where he founded the union. In 1994, IDATU merged with the Irish National Union of Vintners', Grocers' and Allied Trades Assistants to form Mandate.