The Weil reciprocity law asserts that, given two meromorphic functions f, g on a compact complex curve, the product of the values of f over the roots and poles of g is equal to the product of the values of g over the roots and poles of f. We state and prove a tropical version of this reciprocity; the tropical ideas lead to yet another transparent “combinatorial” proof of the classical Weil reciprocity law. Then, we construct a tropical Weil pairing on the set of divisors of degree zero.