The Postal and Telecommunications Workers' Union was a trade union representing communication workers in Ireland. The union was founded in 1923 when the Irish Postal Union merged with the Irish Postal Workers' Union and the Irish Post Office Engineering Union (IPOEU), and was initially named the United Postal Union. The union immediately affiliated with the Irish Trades Union Congress, and from the start worked closely with the British Union of Post Office Workers. The IPOEU was unhappy with the merger arrangements, and so it withdrew early on, to continue an independent existence. The union was soon renamed as the Post Office Workers' Union (POWU).