Joseph Leeson may refer to:Joseph Leeson, 1st Earl of Milltown (1701–1783), Irish peer Joseph Leeson, 2nd Earl of Milltown (1730–1801), Irish peer, son of the above Joseph Leeson, 4th Earl of Milltown (1799–1866), Irish peer Joseph Leeson, 5th Earl of Milltown (1829–1871), Irish peer Joseph F. Leeson Jr., U.S. District Judge