Harsefeld (in High German, in Low Saxon: Harsfeld; literally horse field) is a municipality situated south-west of Hamburg (Germany).

After the carve-up of the duchy in 1180, Harsefeld belonged to the Prince-Archbishopric of Bremen, a new territory of imperial immediacy of the Holy Roman Empire.

In the mid-16th century, when most inhabitants of the prince-archbishopric adopted Lutheranism, the archabbey remained a stronghold of Catholicism.

During the Leaguist occupation under Tilly (1628–1630), the archabbey became a starting point for the attempts of re-Catholicisation.

In 1648 the prince-archbishopric was transformed into the Duchy of Bremen, which was first ruled in personal union by the Swedish crown.