The electron was discovered by:
J. J. Thomson
The electron was discovered by J. J. Thomson in 1897 during his experiments on cathode rays. He showed that the rays coming from the cathode in a discharge tube were made of negatively charged particles, whose charge-to-mass ratio was the same whatever gas or cathode material was used. These universal negative particles are what we now call electrons.
Dalton had already proposed his atomic theory in the early 1800s, but he treated atoms as indivisible and did not discover any sub-atomic particle. Rutherford, working later, discovered the nucleus and the proton, not the electron. Niels Bohr proposed the model in which electrons move in fixed orbits, but by then the electron itself had already been discovered by Thomson.
Hence, the answer is J. J. Thomson.
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