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We propose that all light fermionic degrees of freedom, including theStandard Model (SM) fermions and all possible light beyond-the-standard-modelfields, are chiral with respect to some spontaneously broken abelian gaugesymmetry. Hypercharge, for example, plays this role for the SM fermions. Weintroduce a new symmetry, $U(1)_{\nu}$, for all new light fermionic states.Anomaly cancellations mandate the existence of several new fermion fields withnontrivial $U(1)_{\nu}$ charges. We develop a concrete model of this type, forwhich we show that (i) some fermions remain massless after $U(1)_{\nu}$breaking -- similar to SM neutrinos -- and (ii) accidental global symmetriestranslate into stable massive particles -- similar to SM protons. Theseingredients provide a solution to the dark matter and neutrino mass puzzlesassuming one also postulates the existence of heavy degrees of freedom that actas "mediators" between the two sectors. The neutrino mass mechanism describedhere leads to parametrically small Dirac neutrino masses, and the model alsorequires the existence of at least four Dirac sterile neutrinos. Finally, wedescribe a general technique to write down chiral-fermions-only models that areat least anomaly-free under a $U(1)$ gauge symmetry.

New Chiral Fermions, a New Gauge Interaction, Dirac Neutrinos, and Dark Matter