Adalard, also known as Adalhard or Alard, and called the Seneschal, was a Frankish nobleman of the 9th century.
He served as warden of the Norman march from 861 to 865, and was Lord Chancellor of France under Louis the Pious.
After the Treaty of Verdun (in 843), Adalard went to serve Louis the German in East Francia.
In 861, after the revolt of Carloman, Louis' eldest son, Adalard and his relatives Udo, Berengar, and Waldo took refuge at the court of Charles in Paris.
After peace was settled, Charles transferred the March to Gosfrid, the representative of the Rorgonids.