We prove that a $C^2$ diffeomorphism $f$ of a compact manifold $M$
satisfies Axiom A and the strong transversality condition if and
only if it is Hölder stable, that is, any $C^1$ diffeomorphism
$g$ of $M$ sufficiently $C^1$ close to $f$ is conjugate to $f$ by a
homeomorphism which is Hölder on the whole manifold.