  Leptoquarks (LQs) have attracted increasing attention within recent years,
mainly since they can explain the flavor anomalies found in $R(D^{(*)})$, $b
\rightarrow s \ell^+ \ell^-$ transitions and the anomalous magnetic moment of
the muon. In this article, we lay the groundwork for further automated analyses
by presenting the complete Lagrangian and the corresponding set of Feynman
rules for scalar leptoquarks. This means we consider the five representations
$\Phi_1, \Phi_{\tilde1}, \Phi_2, \Phi_{\tilde2}$ and $\Phi_3$ and include the
triple and quartic self-interactions, as well as couplings to the Standard
Model (SM) fermions, gauge bosons and the Higgs. The calculations are performed
using FeynRules and all model files are publicly available online at
https://gitlab.com/lucschnell/SLQrules.
