William Foulis

William Foulis may refer to:


 * Sir William Foulis, 4th Baronet (1659–1741), of the Foulis baronets
 * Sir William Foulis, 5th Baronet (c. 1680–1756), of the Foulis baronets
 * Sir William Foulis, 6th Baronet (1729–1780), of the Foulis baronets
 * Sir William Foulis, 7th Baronet (1759–1802), of the Foulis baronets
 * Sir William Foulis, 8th Baronet (1790–1845), of the Foulis baronets
 * Sir William Liston-Foulis, 8th Baronet (1812–1858), of the Foulis baronets
 * Sir William Liston-Foulis, 10th Baronet (1869–1918), of the Foulis baronets