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At present, there are outstanding discrepancies between standard modelpredictions and measurements of the muon's $g-2$ and several $B$-mesonproperties. We resolve these anomalies by considering a two-Higgs-doublet modelextended to include leptoquarks and a dark Higgs boson $S$. The leptoquarksmodify $B$-meson decays and also induce an $S \gamma \gamma$ coupling, whichcontributes to the muon's $g-2$ through a Barr-Zee diagram. We show that, forTeV-scale leptoquarks and dark Higgs boson masses $m_{S} \sim10-200~\text{MeV}$, a consistent resolution to all of the anomalies exists. Themodel predicts interesting new decays, such as $B \to K^{(*)} e^+ e^-$, $B \toK^{(*)} \gamma \gamma$, $K \to \pi \gamma \gamma$, and $h \to \gamma \gamma\gamma \gamma$, with branching fractions not far below current bounds.

Resolving the $(g-2)_{\mu}$ and $B$ anomalies with leptoquarks and a dark Higgs boson