Philip R. Bunker (born 29 June 1941) is a British-Canadian scientist and author, known for his work in theoretical chemistry and molecular spectroscopy.

He received a bachelor's degree at King's College in 1962 and earned a Ph.D. in theoretical chemistry from Cambridge University in 1965, advised by H.C. Longuet-Higgins.

[2] During Bunker's Ph.D. work in 1963, Longuet-Higgins published the paper that introduced molecular symmetry groups consisting of feasible nuclear permutations and permutation-inversions.

[4] After obtaining his Ph.D. degree, he was a postdoctoral fellow with Jon T. Hougen in the spectroscopy group of Gerhard Herzberg at the National Research Council of Canada.

[5] Philip Bunker's published scientific work has focused on the use of fundamental quantum mechanics to predict and interpret the spectral properties of polyatomic molecules due to their combined rotational, vibrational, electronic and nuclear-spin states, and their symmetries.