Kurt Alfred Georg Mendelssohn FRS was a German-born British medical physicist, elected a Fellow of the Royal Society in 1951.

The Mendelssohn family are the descendants of Mendel of Dessau. The German Jewish philosopher Moses Mendelssohn and his brother Saul were the first to adopt the surname Mendelssohn. The family includes his grandson, the composer Felix Mendelssohn, and his granddaughter, the composer Fanny Mendelssohn.