Noblessner (also known as Peetri sadam) is a harbour and former industrial area in the northern district of Tallinn, Estonia. Since 2013 it has been redeveloped into a cultural and residential area with a museum, art centre, craft brewery, marina, seafront promenade and cafes and restaurants.

Noblessner's history dates back to 1912 when Emanuel Nobel (nephew of Alfred Nobel) and Arthur Lessner founded the Russian Empire's most important submarine factory. The name "Noblessner" is a fusion of the two men's surnames.

The factory built a total of 12 modern submarines in Noblessner between 1913 and 1917. An order for an additional 20 ocean submarines came in 1916, but due to the 1917 October Revolution, they never started making them. After Estonian independence in 1918 the shipyard started manufacturing smaller vessels instead of submarines. In 1925 the shipyard declared bankruptcy due to the lack of orders, and smaller enterprises also involved in shipbuilding divided the buildings among themselves. The various enterprises merged at the beginning of the Soviet occupation. In 1944–1951 the shipyard operated as Tallinn Marine Factory (Tallinna Meretehas) and it repaired the Baltic Fleet’s minesweepers. Over the following decades, the shipyard was renamed Marine Factory No. 7 and Shipyard No. 7. The company built vessels for the Soviet Navy and repaired whaling vessels and fishing trawlers. In 1991, when Estonia restored its independence, the shipyard became the Tallinn Marine Factory again. The last vessels were built in 2018.

Today, many of the historic industrial buildings in Noblessner have found new life through repurposing and rehabilitation. Constructed primarily in the 1910s, the buildings of Noblessner represent typical industrial design from the era.

The two-story building located at Tööstuse 48 served the administrative needs of the Noblessner factories. Designed by architect V. Sakharov and completed in 1914, it features a number of Art Nouveau elements.

Noblessner’s Ship Systems Workshop, a typical industrial building for its era, operates today as the KAI art center. Constructed in 1916, the building has a unique convex roof with a small triangular roof lamp running along the ridge that allows natural light into the building. Windows punctuate the building’s façade, covering about half of the surface. While the building retains a number of features from its original construction, since 2019 it has focused on showcasing contemporary art and providing a cultural center for everyone in Noblessner to enjoy.

Engineering company Christiani & Nielsen helped design the Noblessner foundry. The building also included a one-story boiler house half-buried the ground, covered with sheet metal, and bridged with concrete arches. The boilers were heated in a workshop and steam was supplied to the smithy furnaces.

In October 2019, Proto invention factory opened the foundry doors as a family-friendly center where people can explore unique inventions and technological innovations. In addition to exhibits, the good acoustics of the space make it well-suited for a variety of cultural events. Since 2009 there have been different orchestra concerts, some of them conducted by Tõnu Kaljuste, and all of Arvo Pärt’s and Heino Eller’s symphonies have been played there.