Dirk Langendijk (Rotterdam, 8 March 1748 – 15 December 1805), often written as Langendyk in his day, was a Dutch draftsman, painter, and etcher. He achieved particular fame for his vivid depictions of battles, naval battles, and other military scenes from the Patriot era (c. 1780–1800) and from the French Revolutionary and Napoleonic Wars (from 1792).

Langendijk was born in Rotterdam's Bierhaven harbor. His father, Hendrik Langendijk from Wijhe, worked for the VOC chamber in Rotterdam as a garbuleur: someone who cleaned, selected, and graded spices. His mother was Hendrina van der Kamp from Arnhem. Langendijk received his initial training from Dirck Anthonie Bisschop (1708–1758), a painter who decorated interiors, coats of arms, and carriages, among other things. Langendijk shifted his focus early on to military subjects, which is evident in his early sketches of horses and soldiers (1769–1777).

His personal life had a dark side: he was unhappily married and sought solace in narcotics. Langendijk died in 1805, relatively young. His son, Jan Anthonie Langendijk (1780–1818), followed in his footsteps as a draftsman.