The western barn owl's subspecies consists of the T. a. alba which are from the British Isles.
T. a. alba (Scopoli, 1769) Light-coloured adult T. a. guttata (C. L. Brehm, 1831) In flight, Sandesneben (Germany) T. a. poensis (Fraser, 1842) T. a. thomensis (Hartlaub, 1852) 
