  In this talk I discuss the interplay between collider physics and four topics
of astro-particle physics: neutrino oscillations, electroweak baryogenesis, LSP
Dark Matter, and ultra-high energy cosmic rays (UHECR). Some astrophysical
scenarios can (only) be tested decisively at colliders. In other cases input
from collider experiments is required to sharpen predictions for future
astro--particle physics experiments, e.g. for the LSP detection rate or the
UHECR spectrum in top--down models.
