  We present theories of `Natural Neutrinos' in which neutral fermionic top
partner fields are simultaneously the right-handed neutrinos (RHN), linking
seemingly disparate aspects of the Standard Model structure: a) The RHN top
partners are responsible for the observed small neutrino masses, b) They help
ameliorate the tuning in the weak scale and address the little hierarchy
problem, and c) The factor of $3$ arising from $N_c$ in the top-loop Higgs mass
corrections is countered by a factor $3$ from the number of vector-like
generations of RHN. The RHN top partners may arise in
pseudo-Nambu-Goldstone-Boson (pNGB) Higgs models such as the Twin Higgs, as
well as more general Composite, Little, and Orbifold Higgs scenarios, and three
simple example models are presented. This framework firmly predicts a TeV-scale
seesaw, as the RHN masses are bounded to be below the TeV scale by naturalness.
The generation of light neutrino masses relies on a collective breaking of
lepton number, allowing for comparatively large neutrino Yukawa couplings and a
rich associated phenomenology. The structure of the neutrino mass mechanism
realizes in certain limits the Inverse or Linear classes of seesaw. Natural
Neutrino models are testable at a variety of current and future experiments,
particularly in tests of lepton universality, searches for lepton flavor
violation, and precision electroweak and Higgs coupling measurements possible
at high energy $e^+ e^-$ and hadron colliders.
