Kettler (surname)

Kettler is a surname of Germanic origins, particularly in Germany and Austria. Notable people with the surname include:
 * Donald Joseph Kettler (born 1944) Catholic Bishop of St Cloud.
 * Ferdinand Kettler (1655–1737) Duke of Courland
 * Frederick Casimir Kettler (1650–1698) Duke of Courland
 * Gotthard Kettler (1517–1587), founder of the Duchy of Courland
 * Jacob Kettler (1610–1682) Duke of Courland
 * Robert C. Kettler, Washington D.C. area real estate developer (born 1952)
 * Wilhelm Kettler (1574–1640) Duke of Courland
 * Frederick William, Duke of Courland or Friedrich Kettler (1692–1711)
 * House of Kettler Noble House