Leithum, Luxembourg is a populated place in the district of Diekirch, at one end of the border that was established in 1839 between Belgium and Luxembourg at the Treaty of London.

Leithum
A church in Leithum
Leithum
Coordinates: 50°09′39″N 6°06′32″E / 50.16083°N 6.108889°E / 50.16083; 6.108889
Country	Luxembourg
Commune	Diekirch

Located at the north-east corner of Luxembourg, Leithum's border crossing connects it by direct roads to both Oberhausen and Stubach 1 kilometer away in Belgium's Hohes Venn-Eifel nature park, and there across the German border to Welchenhausen and Stupbach, respectively.