Seemannsmission Altona, Seafarers' mission in Altona-Altstadt, Germany

Seemannsmission Altona is a red-brick, flat-roofed building at Große Elbstraße 132, directly on the Elbe by the Holzhafen. Kurt Stoltenberg designed it in the Bauhaus style, without facade ornament, for the Raabe & Wöhlecke office; it opened in 1930. Inside are a 34-room hotel, a seamen's club bar and the St. Clemens am Hafen church, plus the seamen's chaplaincy of the Nordkirche.

The association was registered in 1902 as the "Altonaer Fischer- und Schifferstube", after a seamen's parlour opened at the Altona fish market in 1898. A plot at Große Elbstraße was acquired in 1916, but inflation after World War I prevented construction. The present building, designed by Kurt Stoltenberg of Raabe & Wöhlecke, was begun on 8 May 1929 and opened on 24 April 1930.

The mission serves as a gathering place for seafarers from around the world who find community during their time in the city. It offers a space where people far from home can connect and feel part of something larger than themselves.

The building stands at Große Elbstraße 132–134 in Altona-Altstadt, directly on the Elbe by the Holzhafen. The hotel, seafarers' club and St. Clemens am Hafen church are open to the public, not only to seafarers. The site is listed as monument no. 16539.

The basement houses a club where seafarers play billiards, table tennis, and other games while socializing with one another. This space has become a gathering spot where maritime workers form friendships and recover from the isolation of long journeys at sea.