De Laet is a Dutch-language occupational surname. A "laet" (modern spelling "laat") was a type of (released) serf.^[1] The archaic spelling De Laet is most common in Belgium, especially around Antwerp,^[2] while "de Laat" is more common in the Netherlands, especially in North Brabant.^[3] People with this name include:

De Laet / DeLaet

• Carlos de Laet (1847–1927), Brazilian journalist, professor and poet
• Jaspar Laet, 16th-century Flemish medical astrologer and almanac maker
• Graham DeLaet (born 1982), Canadian golfer
• Lost Frequencies, real name Felix De Laet (born 1993), Belgian DJ and record producer
• Joannes de Laet (1581–1649), Dutch geographer and director of the Dutch West India Company
• Ritchie De Laet (born 1988), Belgian footballer

De Laat / DeLaat

• Itzhak de Laat (born 1994), Dutch short-track speed-skater
• Jacqueline DeLaat (1943–2009), American political scientist
• Sanne de Laat (born 1995), Dutch archer