  Primordial non-Gaussianities (PNG) leave unique signatures in the bispectrum
of the large-scale structure. With upcoming galaxy surveys set to improve PNG
constraints by at least one order of magnitude, it is important to account for
any potential contamination. In our work we show how to include wide-angle
effects into the 3-dimensional observed galaxy bispectrum. We compute the
leading wide-angle corrections to the monopole, finding that they could mimic
local PNG with an amplitude of $f_{\rm NL} = \mathcal{O}\left( 0.1 \right)$. We
also compute the dipole induced by wide-angle effects, whose amplitude is a
few-percent of the flat-sky monopole. We estimate that wide-angle effects in
the monopole can be safely neglected for survey volumes of the order of
$8~\mathrm{Gpc}^3 h^{-3}$, while the dipole can start being detected from
surveys probing volumes larger than $50~\mathrm{Gpc}^3 h^{-3}$. Our formalism
can be readily adapted to realistic survey geometries and to include
relativistic effects, which may become relevant at high redshifts.
