Börßum is a municipality in the district of Wolfenbüttel, in Lower Saxony, Germany.

Parts of its municipality are Börßum, Achim, Bornum, Kalme and Seinstedt.

In 1954, the Catholic Curacy of Börßum was founded by the merge of the two parochial vicariates of Hornburg and Semmenstedt.

In 2011, the church was desecrated, most recently it belonged to the parish of St. Petrus in Wolfenbüttel.

Börßum offers a primary school (built 1899, rebuilt 2002/03), a kindergarten, two doctors, a pharmacy, a pub, an optician, restaurants and since 2009 a diner.