  By analyzing $4.48\times10^8$ $\psi(3686)$ events collected with the BESIII
detector, we observe the decays $\chi_{cJ} \to n K^0_S\bar\Lambda + c.c.$
($J=0$, 1, 2) for the first time, via the radiative transition $\psi(3686) \to
\gamma \chi_{cJ}$. The branching fractions are determined to be $(6.67 \pm
0.26_{\rm stat} \pm 0.41_{\rm syst})\times10^{-4}$, $(1.71 \pm 0.12_{\rm stat}
\pm 0.12_{\rm syst})\times10^{-4}$, and $(3.66 \pm 0.17_{\rm stat} \pm
0.23_{\rm syst})\times10^{-4}$ for $J=0$, 1, and 2, respectively.
