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We present a catalog of 208 $0.3 < z < 2.1$ Emission Line Galaxies (ELG)selected from 1D slitless spectroscopy obtained using Hubble's WFC3 G102 grism,as part of the Faint Infrared Grism Survey (FIGS). We identify ELG candidatesby searching for significant peaks in all continuum-subtracted G102 spectra,and, where possible, confirm candidates by identifying consistent emissionlines in other available spectra or with published spectroscopic redshifts. Weprovide derived emission line fluxes and errors, redshifts, and equivalentwidths (EW) for H$\alpha$ $\lambda6563$, [OIII]$\lambda\lambda4959,5007$, and[OII]$\lambda\lambda3727$ emission lines, for emission line galaxies down toAB(F105W) $ > 28$ and $> 10^{-17}$ erg cm$^{-2}$ s$^{-1}$ line flux. We use theresulting line catalog to investigate a possible relationship between lineemission and a galaxy's environment. We use 7th-nearest-neighbor distances toinvestigate the typical surroundings of ELGs compared to non-ELGs, and we findthat [OIII] emitters are preferentially found at intermediate galaxy densitiesnear galaxy groups. We characterize these ELGs in terms of the galaxy specificstar formation rate (SSFR) versus stellar mass, and find no significantinfluence of environment on that relation. We calculate star formation rates(SFR), and find no dependence of SFR on local galaxy surface density for $0.3 <z < 0.8$ H$\alpha$ emitters and for $0.8<z<1.3$ [OIII] emitters. We findsimilar rates of close-pair interaction between ELGs and non-ELGs. For galaxysurface densities $\Sigma \leq 30$ Mpc$^{-2}$, we find no consistent effect ofenvironment on star formation.

A Catalog of Emission-Line Galaxies from the Faint Infrared Grism Survey: Studying Environmental Influence on Star Formation