Labour is New Zealand's oldest political party - started 100 years ago on July 7, 1916.
Members of its Whanganui branch met to mark the centenary on Thursday this week, with drinks at the Grand Hotel.
The hotel has been the venue for many a party election meeting. Branch deputy chairman Bob Dempsey said it had "good vibe" for members.
The celebrations went "very well", with just over 30 people attending, he said.
"Several people brought various memorabilia from the party's history, things from way back like news paper articles from 90 years ago."