Hamra gård, Farm building in Tumba, Sweden

Hamra gård is a farm in Botkyrka Municipality that developed around dairy production and agricultural research in Stockholm County, Sweden. The grounds feature traditional barn structures, specialized milking installations, and research facilities that expanded over many decades.

Gustaf de Laval purchased the property in 1894 and established it as the center for his separator manufacturing company with modern dairy facilities and model barns. Over decades it evolved into a research facility that advanced innovations in milking technology.

The name Hamra is shared by the farm, its industrial railway and the preserved steam locomotive No. 5 Hamra, now kept by Östra Södermanlands Järnväg. On the grounds stands the runestone Sö 289, and the farm today runs as DeLaval's demonstration farm and research centre, with buildings such as Stora ladugården, Utvecklingsladugården and VMS-ladugården.

The farm operates as a demonstration and research center for milking equipment, cooling systems, barn designs, and feeding technology. Plan ahead as not all areas are open to visitors at all times.

The steam locomotive named Hamra, number 5, survives not at the farm but on the Östra Södermanlands Järnväg heritage line, where it is kept as a working museum piece. On the grounds themselves stands the runestone Sö 289, a Viking Age monument that predates the dairy by centuries.