Sir Wilhelm Philipp Daniel Schlich KCIE FRS FLS (28 February 1840 in Flonheim – 28 September 1925 in Oxford), also known as William Schlich, was a German-born forester who worked extensively in India for the British administration. As a professor at Cooper's Hill, he influenced colonial forestry across the British colonies. His major work was a five volume Manual of Forestry (1889-96).