We prove non-commutative reciprocity formulae for certain polynomials using
Fox's free differential calculus. The abelianizations of these reciprocity
formulae rediscover the polynomial reciprocity formulae of Carlitz and Ber
ndt-Dieter. Further, many other reciprocity formulae related to Dedekind su
ms are rederived from our polynomial reciprocity formulae; these include, f
or instance, generalizations of the classical Eisenstein reciprocity formul
a.