Jacob Lacops was a 16th-century Norbertine priest and martyr who lived in the Low Countries. Born in Oudenaarde around 1541, he initially joined the Premonstratansian Order before briefly converting to Protestantism and writing literature against the Catholic Church. After being persuaded by his family to return to the Catholic faith, he underwent a period of penance at Marienweerd Abbey. He later served as an assistant parish priest in Monster until his death in 1572.