The Irish Agricultural Organisation Society (IAOS) was an agricultural association in Ireland which advocated, and helped to organise, agricultural cooperativism. From its establishment in 1894, it quickly became an important element of the Irish economy and laid the foundations of the successful Irish dairy industry. Although officially nonpolitical, the IAOS became associated with the Irish Home Rule movement and Irish nationalist activity from its inception. It was later reorganised and renamed as the Irish Co-operative Organisation Society Limited, a body which continues to operate in the Republic of Ireland.