The Monet and the Impressionists art exhibition at Te Papa earlier this year, brought $34.5 million to the Wellington economy.
A report by financial strategists McDermott Miller says the exhibition also created the equivalent of 341 fulltime jobs in the capital.
The exhibition was the largest collection of Impressionism painting to be brought to New Zealand.
It included 27 paintings by Claude Monet and pieces by Renoir, Degas, Cezanne and Pissarro.
More than 150,000 people attended the exhibition, with 52% from outside the Wellington region.