  We prove two transformations for the $p$-adic hypergeometric functions which
can be described as $p$-adic analogues of a Euler's transformation and a
transformation of Clausen. We first evaluate certain character sums, and then
relate them to the $p$-adic hypergeometric functions to deduce the
transformations. We use a character sum identity proved by Ahlgren, Ono, and
Penniston to deduce the $p$-adic Clausen's transformation. We also deduce
special values of certain $p$-adic hypergeometric functions.
