The Collaborative International Dictionary of English v.0.48:

Promisee \Prom`is*ee"\, n. (Law)
   The person to whom a promise is made.
   [1913 Webster]

WordNet (r) 3.0 (2006):

promisee
    n 1: a person to whom a promise is made

Bouvier's Law Dictionary, Revised 6th Ed (1856):

PROMISEE. A person to whom a promise has been made.
     2. In general a promisee can maintain an action on a promise made to
him, but when the consideration moves not from the promisee, but some other
person, the latter, and not the promisee, has a cause of action, because he
is the person for whose use the contract was made. Latch, 272; Poph. 81; 3
Cro. 77; 1 Raym, 271, 368; 4 B. & Ad. 434; 1 N. & M. 303; S. C. Cowp. 437;
S. C. Dougl. 142. But see Carth. 5 2 Ventr. 307; 9 M. & W. 92) 96.