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We report the discovery of a large, dynamically cold, coeval stellar streamthat is currently traversing the immediate solar neighborhood at a distance ofonly 100 pc. The structure was identified in a wavelet decomposition of the 3Dvelocity space of all stars within 300 pc to the Sun. Its members form a highlyelongated structure with a length of at least 400 pc, while its vertical extentmeasures only about 50 pc. Stars in the stream are not isotropicallydistributed but instead form two parallel lanes with individual localoverdensities, that may correspond to a remnant core of a tidally disruptedcluster or OB association. Its members follow a very well-defined main sequencein the observational Hertzsprung-Russel diagram and also show a remarkably low3D velocity dispersion of only 1.3 km s$^{-1}$. These findings strongly suggesta common origin as a single coeval stellar population. An extrapolation of thepresent-day mass function indicates a total mass of at least 2000 M$_\odot$,making it larger than most currently known clusters or associations in thesolar neighborhood. We estimated the stream's age to be around 1 Gyr based on acomparison with a set of isochrones and giant stars in our member selection andfind a mean metallicity of $\left[ \mathrm{Fe/H} \right] = -0.04$. Thisstructure may very well represent the Galactic disk counterpart to theprominent stellar streams observed in the Milky Way halo. As such, itconstitutes a new valuable probe to constrain the Galaxy's mass distribution.

Extended stellar systems in the solar neighborhood - II. Discovery of a nearby 120{\deg} stellar stream in Gaia DR2