Willem Linnig the Elder or Willem Linnig Senior was a Belgian painter and engraver who is best known for his history and genre scenes and interiors painted in a style which is reminiscent of 17th century Flemish and Dutch genre painting. He taught for some time at the Fine Arts School of Weimar.

Willem Linnig was born in Antwerp as the son of Pieter-Josef Linnig (born in Aschbach, Rhineland-Palatinate in Germany) and Catharina Josephina Leys. His father was a cabinetmaker. He had two brothers (Jan Theodoor) Jozef Linnig and Egide Linnig who both became artists.

Linnig studied at the Antwerp Academy of Fine Arts, where the prominent history and genre painter Jan August Hendrik Leys was one of his teachers. One of his class mates was Victor Lagye.

In 1844, Willem Linnig and his brother Egide spent some time in The Hague. In the Mauritshuis museum in The Hague, they studied the works of old and contemporary masters. In 1847 the two brothers sailed to Norway. Willem later moved to Weimar where he established in 1877 a local association of etchers (Gesellschaft für Radierkunst). He taught at the Weimar Saxon Grand Ducal Art School in Weimar from 1876 to 1882 and also served as its director. Willem's son, also named Willem, who had been trained by his father, joined him on Weimar and also taught at the local Art School.

Willem Linnig the elder and his son Willem junior were among a large number of Antwerp artists who established the 'Vereeniging der Antwerpsche etsers' or 'l'Association des aquafortistes anversois' ("Association of Antwerp Etchers") founded in 1880. The co-founders included Léon Abry, Constant Cap [de], Florent Crabeels, Edgard Farasyn, Jean Pierre François Lamorinière, Egide François Leemans, Joseph Van Luppen [nl], Isidore Meyers [nl], Jean Baptiste Pierre Michiels, Karel Ooms, Max Rooses, Hendrik Frans Schaefels, Lucas Victor Schaefels, Jan Stobbaerts, Frans Van Kuyck, Piet Verhaert, A.-J. Verhoeven, Jozef Bal and Charles Verlat. The Vereeniging would publish an annual album containing graphic works of its members.

Linnig died in Antwerp on 8 August 1885.