Claude Hermann Walter Johns (20 February 1857 – 1920) was an Assyriologist and Church of England clergyman.
He was born at Banwell, Somerset. He was educated at Queens' College, Cambridge (B.A., 1880), and was second master successively at Horton College, Tasmania, in 1880–84 and Paston Grammar School, in 1884–86.
He was ordered deacon in 1887 and ordained priest in the following year, and from 1887 until 1892 was tutor in St Peter's Training College for Schoolmasters, Peterborough, as well as curate of St Botolph's, Helpston (1887–88), and of St John's, Peterborough (1888–91).
In 1892 Johns became rector of St Botolph's Church, Cambridge. He was also chaplain of Queens' College from 1893 to 1901. He had taken up the study of cuneiform, encouraged by Sandford Arthur Strong, and from 1897 was lecturer in Assyriology at Cambridge University, as well as in Assyrian at King's College, London, from 1904. He was Edwards Fellow in Cambridge University from 1900, honorary secretary of the Cambridge Pupil Teachers' Centre from 1894 to 1900, and Master of St Catharine's College, Cambridge from 1909 to 1920 (also bursar, for some of this time).