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Using a sample of $(27.12\pm 0.14) \times 10^{8}$ $\psi(3686)$ eventscollected with the BESIII detector, the decay $\psi(3686) \to \Lambda\bar{\Lambda} \eta'$ with $\eta'$ subsequently decaying into $\gamma \pi^+\pi^-$ and $\eta \pi^+ \pi^-$ is observed for the first time. The branchingfraction of $\psi(3686) \to \Lambda \bar{\Lambda}\eta'$ is measured to be$(7.34\pm0.94(stat.)\pm0.43(sys.))\times10^{-6}$. No resonant structures areevident in the $\Lambda\eta'$, $\bar{\Lambda}\eta'$ and $\Lambda\bar{\Lambda}$mass spectra.

Observation of $\psi(3686) \rightarrow \Lambda \bar{\Lambda} \eta^{\prime}$ decay