William Foulis
William Foulis may refer to:
- Sir William Foulis, 4th Baronet, of the Foulis baronets
- Sir William Foulis, 5th Baronet, of the Foulis baronets
- Sir William Foulis, 6th Baronet, of the Foulis baronets
- Sir William Foulis, 7th Baronet, of the Foulis baronets
- Sir William Foulis, 8th Baronet, of the Foulis baronets
- Sir William Liston-Foulis, 8th Baronet, of the Foulis baronets
- Sir William Liston-Foulis, 10th Baronet, of the Foulis baronets