Hans Neuendorf (born 1937) is a German art gallery founder, art dealer and entrepreneur, he has also released several publications.

Neuendorf was born in 1937 in Hamburg, Germany and grew up during the World War II. He started in the art business as a teenager by hitchhiking to Paris to purchase fine art prints by modernist Marc Chagall and Fernand Leger, which he took back to Hamburg to sell.

Neuendorf founded his first art gallery Galerie Neuendorf, in 1964 and hosting the first art pop exhibition in Germany. In 1967 he co-founded the first-ever [art fair]], which took place in Cologne, Germany. As an art dealer, Neuendorf mounted dozens of critically acclaimed exhibitions featuring seminal artists including Georg Baselitz, Cy Twombly, David Hockney, Francis Picabia, Lucio Fontana, and more. Neuendorf has cited his favourite artist as Cy Twombly .

He founded the online website Artnet, a database of art prices, which became the first art site to go online in 1989. In 2012, he handed over the role of chief executive of the business to his son, Jacob Pabst. Two of his sons and daughter Sophie are also involved in the company, serving as vice president. Neuendorf became involved in the industry when he traveled to France in the 1960s. Artnet has also formed partnerships with the auction house Sotheby's.

Its sister project Artnet Magazine was after (Slate) the second publication to go online.