  In this article we calculate the post-Newtonian limit of a general class of
scalar-nonmetricity theories of gravity. The action is assumed to be a free
function of the nonmetricity scalar, the kinetic term of the scalar field, two
derivative couplings and the scalar field itself. We use the parametrized
post-Newtonian formalism to solve the arising field equations for the case of a
massless scalar field in order to compare several subclasses of this theory to
solar system observations. In particular, we find several classes of theories
which are indistinguishable from general relativity on the post-Newtonian level
and therefore, should be studied further. Most remarkably, we find that this is
the generic case, while a post-Newtonian limit that deviates from general
relativity occurs only for a particular coupling between the scalar field and
nonmetricity.
