1. The theory of Integral Equations, which is an important branch of the wider theory of Functionals, has been developed by mathematicians during the past 60 years. Many valuable applications of these equations have been made in various branches of applied mathematics, including economics, biology, and especially physics. It is believed, too, that they may not be entirely void of interest to the actuary. In this paper, therefore, a brief discussion of integral equations is given, and various problems involving their use are considered. It may be that some of these problems will be thought artificial, or trivial, or both. The writer would request, however, that the examples be regarded as illustrative only. If any of them should suggest new and more important problems to actuaries, or if the methods developed herein should prove of value in the solution of present problems, the purpose of this paper will be achieved.