Nicholas More Seymour is an Australian musician and record producer. He is the founding bass guitarist and a mainstay of the rock group Crowded House, and is the younger brother of Mark Seymour, singer-songwriter-guitarist in the rock band Hunters and Collectors.

Crowded House are a rock band, formed in Melbourne, Victoria, Australia, in 1985. Its founding members were New Zealander Neil Finn and Australians Paul Hester (drums) and Nick Seymour (bass). Later band members included Finn's brother Tim who was in their former band together Split Enz, sons Liam and Elroy, as well as Americans Mark Hart and Matt Sherrod, with Neil Finn and Seymour being the sole constant members.