Henry Parry Liddon (1829–1890), usually cited as H. P. Liddon, was an English theologian. From 1870 to 1882, he was Dean Ireland's Professor of the Exegesis of Holy Scripture at the University of Oxford.

The position of Dean Ireland's Professor of the Exegesis of Holy Scripture was established at the University of Oxford in 1847. This professorship in the critical interpretation or explanation of biblical texts, a field known as exegesis, was instituted by John Ireland, who was Dean of Westminster from 1816 until his death in 1842. He founded scholarships in his lifetime at the University of Oxford, which are still awarded after an examination to undergraduates "for the promotion of classical learning and taste". In his will, he left £10,000 to the university, with the interest arising to be applied to the professorship. The first professor, Edward Hawkins, was appointed in 1847. The second Dean Ireland's Professor, Robert Scott, had won an Ireland scholarship in 1833 while studying at Christ Church.