  In this article we study gravitational lensing by non-rotating and
asymptotically flat black holes in Horndeski theory. By adopting the strong
deflection limit, we calculate the deflection angle, from which we obtain the
positions and the magnifications of the relativistic images. We compare our
results with those corresponding to black holes in General Relativity. We
analyze the astrophysical consequences in the case of the nearest supermassive
black holes.
