Alfhausen is a village in the collective municipality (Samtgemeinde) of Bersenbrück in the district of Osnabrück, Lower Saxony, Germany.

The area has a mild maritime climate affected by the moist northwest wind from the North Sea.

Quite a number of its inhabitants emigrated to Baltimore and Cincinnati, Ohio & Northern Kentucky in the United States in the 1830s to 1860s.

[2] In 1971, the Alfsee lake was created as a flood control storage basin for the River Hase; it was named after its closeness to the municipality of Alfhausen.

As a popular destination for holiday makers and day trippers, the lake has gained great importance in recent years.