Bernard O'Reilly (1903–1975) (born Alfonso Bernard O'Reilly) was an Australian author and bushman of Irish descent.
He was born and raised in the Blue Mountains about 50 km (31 mi) north-west of Sydney and later moved to the McPherson Range near Beaudesert in South East Queensland, Australia.
He is part of the family that established the O'Reilly's Guesthouse in the Lamington Plateau.
On 20 August 1931 Bernard O'Reilly married Viola Gwendoline King in Brisbane.