Jan Baptist Lambrechts was an 18th-century Flemish painter. He is mainly known for his genre scenes of drinkers, cooks, maids, vegetable salesmen and dancing farmers.

Jan Baptist Lambrechts was born in Antwerp as the son of Jacob and Anna Deckers. His parents died when he was still very young. His stepbrother Jeroom Lambrechts allowed him to develop his artistic skills through self study. In 1703 he left for Lille with the purpose of selling paintings at the annual fair. This was followed by years of travelling.

Jan Baptist Lambrechts only returned to Antwerp in 1709 where he became a master of the local Guild of St Luke.

He left his hometown Antwerp in 1731, not long before he died.