Paul Lional Edward Helliwell (1915 – 24 December 1976) was an American lawyer, banker, OSS official, and CIA officer. While serving in this capacity he became director of Sea Supply, Inc. and president of Castle Bank & Trust. Helliwell was instrumental in setting up Civil Air Transport and Castle Bank & Trust, both of which were CIA proprietary companies. According to The Wall Street Journal, he was "deeply involved" in financing covert actions against Cuba from 1964 to 1975. Helliwell was reported to have played a key role in the purchase of the site for Disney World.