Source : Webster's Revised Unabridged Dictionary (1913)

Depositor \De*pos"i*tor\ (d[-e]*p[o^]z"[i^]*t[~e]r), n. [L., fr.
   deponere. See {Depone}.]
   One who makes a deposit, especially of money in a bank; --
   the correlative of depository.

Source : WordNet®

depositor
     n : a person who has deposited money in a bank or similar
         institution