We investigate the existence and uniqueness of solutions for Hadamard fractional differential equations with nonlocal integral boundary conditions by applying the Leray–Schauder nonlinear alternative, Leray–Schauder degree theorem, Krasnoselskii’s fixed point theorem, Schaefer’s fixed point theorem, and Banach’s fixed point theorem for nonlinear contractions. Two examples are presented to illustrate the obtained results.