The Cassel Baronetcy, of Lincoln's Inn in the City of London, is a title in the Baronetage of the United Kingdom. It was created on 26 January 1920 for the lawyer and Conservative politician Felix Cassel. He was Judge Advocate General between 1915 and 1934. Cassel was succeeded by his eldest son, the second Baronet. He died unmarried and was succeeded by his younger brother, the third Baronet. He was a barrister and judge. As of 2015 the title is held by his eldest son, the fourth Baronet, who succeeded in 2001. He is the former husband of the life peer Ann Mallalieu, Baroness Mallalieu.
The heir apparent is the present holder's only son Alexander James Felix Cassel (b. 1974).