  We classify all warped $dS_5$ backgrounds in $D=11$ supergravity with
enhanced supersymmetry. We show that backgrounds preserving $N=16$
supersymmetries consist of either a stack of M5 branes with transverse space
$\mathbb{R}^5$, or a generalized M5-brane configuration with transverse space
$\mathbb{R} \times N_4$, where $N_4$ is a hyper-Kahler manifold and the
$M5$-brane harmonic function is determined by a hyper-Kahler potential on
$N_4$. Moreover, we find that there are no backgrounds preserving exactly
$N=24$ supersymmetries. Backgrounds preserving $N=32$ supersymmetries
correspond to either $\mathbb{R}^{1,10}$ or $AdS_7\times S^4$.
