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Motivated by the preponderance of so-called "heavy black holes" in the binaryblack hole (BBH) gravitational wave (GW) detections to date, and the role thatgravitational lensing continues to play in discovering new galaxy populations,we explore the possibility that the GWs are strongly-lensed by massive galaxyclusters. For example, if one of the GW sources were actually located at $z=1$,then the rest-frame mass of the associated BHs would be reduced by a factor$\sim2$. Based on the known populations of BBH GW sources and strong-lensingclusters, we estimate a conservative lower limit on the number of BBH mergersdetected per detector year at LIGO/Virgo's current sensitivity that aremultiply-imaged, of $R_{\rm detect}\simeq10^{-5}{\rm yr}^{-1}$. This isequivalent to rejecting the hypothesis that one of the BBH GWs detected to datewas multiply-imaged at $<\sim4\sigma$. It is therefore unlikely but notimpossible that one of the GWs is multiply-imaged. We identify threespectroscopically confirmed strong-lensing clusters with well constrained massmodels within the $90\%$ credible sky localisations of the BBH GWs from LIGO'sfirst observing run. In the event that one of these clusters multiply-imagedone of the BBH GWs, we predict that $20-60\%$ of the putative next appearancesof the GWs would be detectable by LIGO, and that they would arrive at Earthwithin three years of first detection.

What if LIGO's gravitational wave detections are strongly lensed by massive galaxy clusters?