The Lesum () is a river in northern Germany, right tributary of the Weser, navigable for Class III ships.Längen der Hauptschifffahrtswege der Binnenwasserstraßen des Bundes, Liste 4, Bundesministerium für Verkehr und digitale Infrastruktur It is formed at the confluence of the rivers Wümme and Hamme, near Ritterhude, northwest of Bremen. It flows west and flows into the Weser in Bremen-Vegesack.

Lesum, also named Burglesum is also a borough of Bremen, situated at the confluence of the Lesum and Weser rivers. Known for its green spaces and historic architecture, it forms part of the larger Bremen-Nord district.

See also List of rivers of Bremen List of rivers of Lower Saxony

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