  Recently there has been a surge of interest in regularizing, a $ D \to 4 $
limit of, the Einstein-Gauss-Bonnet (EGB) gravity, and the resulting
regularized $4D$ EGB gravity has nontrivial dynamics. The theory admits
spherically symmetric black holes generalizing the Schwarzschild black holes.
We consider the rotating black hole in regularized $4D$ EGB gravity and discuss
their horizon properties and shadow cast. The effects of the GB coupling
parameter on the shape and size of shadows are investigated in the context of
recent M87* observations from the EHT. Interestingly, for a given spin
parameter, the apparent size of the shadow decreases and gets more distorted
due to the GB coupling parameter. We find that within the finite parameter
space, e.g. for $a=0.1M$, $\alpha\leq 0.00394M^2$, and within the current
observational uncertainties, the rotating black holes of the $4D$ EGB gravity
are consistent with the inferred features of M87* black hole shadow.
