The disclosed computer-implemented method for verifying the authenticity of graphical images may include (1) identifying a graphical image intended for presentation by a display and then, prior to facilitating presentation of the graphical image by the display, (2) identifying an original unique identifier of at least a portion of the graphical image encoded into the graphical image, (3) computing a subsequent unique identifier of the portion of the graphical image, and (4) determining, by comparing the subsequent unique identifier to the original unique identifier, whether the graphical image is authentic. Various other methods, systems, and computer-readable media are also disclosed.