Paul Egerton Piesse is a former co-leader of the Alliance, a New Zealand political party, and union activist.
Piesse has been heavily involved in the union movement, and has held a number of senior organisational roles. He was originally a supporter of the Labour Party, and in 1969 stood for Labour in the Rangiora electorate, coming second.
He joined NewLabour in protest at the economic policies Labour pursued ("Rogernomics") in the late 1980s. NewLabour eventually helped form the Alliance, and Piesse became involved in the new party. In the 1999 election, he stood as the Alliance candidate in the Christchurch East electorate, winning 6.7% of the vote. He was ranked 58th on the Alliance list.
Following the splintering of the Alliance, Piesse sided with the Harré-McCarten faction. In the 2002 election, he stood again as an Alliance candidate, gaining 0.5% of the vote in Waimakariri. He was not on the party list. After Harré and McCarten also left the Alliance, Piesse was elected co-leader, alongside Jill Ovens. In the 2005 election he also stood for the Alliance.
Piesse was elected President of the Alliance Party at the 2007 national conference held in Dunedin. In the 2008 election he contested the Christchurch East electorate and was number 4 on the Alliance Party list. He fared poorly, coming eighth with only 119 votes. The Alliance also did badly, winning only 0.08% of the party vote nationwide. In the 2011 election he also stood for the Alliance.