Gilbert Ning Ling (born December 26, 1919) is a cell physiologist, biochemist and scientific investigator.
In 1944 Ling won the biology slot of the sixth Boxer Indemnity Scholarship, a nationwide competitive examination that allowed Chinese science and engineering students full scholarship to study in a United States university.
In 1947 he co-developed the Gerard-Graham-Ling microelectrode, a device that allows scientists to more accurately measure the electrical potentials of living cells.
In 1962 he proposed the Association induction hypothesis, which claims to be unifying, general theory of the living cell, and is an alternative and controversial hypothesis to the membrane and steady-state membrane pump theories, and three years later added the Polarized-Oriented Multilayer (PM or POM) theory of cell water.
Ling has carried out scientific experiments that attempt to disprove the accepted view of the cell as a membrane containing a number of pumps such as the sodium potassium pump and the calcium pump and channels that engage in active transport.