  Higgs decays to gauge boson pairs are a crucial ingredient in the study of
Higgs properties, with the decay $H\rightarrow\gamma\gamma$ being particularly
sensitive to new physics effects. Assuming all potential new physics occurs at
energies much above the weak scale, deviations from Standard Model predictions
can be parameterized in terms of the coefficients of an effective field theory
(SMEFT). When experimental limits on the SMEFT coefficients reach an accuracy
of a few percent, predictions must be done beyond the lowest order in the SMEFT
in order to match theory and experimental accuracy. This paper completes a
program of computing the one-loop electroweak SMEFT corrections to
$H\rightarrow VV^\prime$, $V=W^\pm,Z,\gamma$. The calculation of the real
contribution to $H\rightarrow W^+W^-\gamma$ is performed by mapping two-loop
amplitudes to the $3-$ body phase space.
