Peter George Harrison (born 1951) is a Professor of Computing Science at Imperial College London known for the reversed compound agent theorem, which gives conditions for a stochastic network to have a product-form solution. Harrison attended Christ's College, Cambridge, where he was a Wrangler in Mathematics (1972) and gained a Distinction in Part III of the Mathematical Tripos (1973), winning the Mayhew Prize for Applied Mathematics. Harrison is an associate editor of The Computer Journal. Via Saharon Shelah and Dov Gabbay, Harrison has an Erdős number of 3.