„Argent, above a triple mountain vert, charged with an escutcheon Argent with two fesses azure, three barry water lily leaves gules.“ 
The arms were granted on April 3rd, 1939. The triple mountain symbolises the location in the southern slopes of the Teutoburger Wald. The three water lily leaves are derived from the arms of the County of Tecklenburg. The small shield with two blue bars are the arms of the Lords of Münster, who lived on the Vortlage castle near Lengerich.
Veddeler, Peter; Wappen, Siegel, Flaggen; Münster 2003; S. 165; ISBN 3-87023-252-8
Unknown authorUnknown author für die Stadt Lengerich

file made by Jürgen Krause
colors according to FIAV