Beresford Neill Parlett (born 1932) is an English applied mathematician, specializing in numerical analysis and scientific computation.

[2] Parlett received in 1955 his bachelor's degree in mathematics from the University of Oxford and then worked in his father's timber business for three years.

From 1965 until his retirement, he was a faculty member of the mathematics department at the University of California, Berkeley.

There he served for some years as chair of the department of computer science, director of the Center for Pure and Applied Mathematics, and professor in the department of electrical engineering and computer science.

[3] Parlett is the author of many influential papers on the numerical solution of eigenvalue problems, the QR algorithm, the Lanczos algorithm, symmetric indefinite systems, and sparse matrix computations.