  Flux compactification of IIB string theory associates special points in
Calabi-Yau moduli space to choices of (pairs of) integral three-form fluxes. In
this paper, we propose that supersymmetric flux vacua are modular. That is, to
a supersymmetric flux vacuum arising in a variety defined over $\mathbb{Q}$, we
associate a two-dimensional Galois representation that we conjecture to be
modular. We provide numerical evidence for our conjecture by examining flux
vacua arising on the octic hypersurface in $\mathbb{P}^{4}(1,1,2,2,2)$.
