Engelmund of Velsen was an English-born Benedictine monk and missionary who worked in Frisia during the 7th and 8th centuries. Although he was raised in England, his parents had lived in Friesland, which allowed him to be fluent in the local language. He eventually joined the mission led by Saint Willibrord to evangelize the region. After being ordained as a priest, he rose to the rank of abbot and established himself at Velsen, near Haarlem.