Human Rights Maps (76): Gender Wage Gap in the U.S.

women's earnings compared to men's, gender wage gap in the US

(source)

Everyone, without any discrimination, has the right to equal pay for equal work (art. 23 of the Universal Declaration). So unequal pay is a human rights issue, and is probably an indication of a deeper kind of discrimination. However, unequal pay is an indication of wage discrimination, not proof. If men and women, on average receive unequal pay, it’s only discrimination if they perform equal work, which isn’t necessarily the case.

More data here. More on gender discrimination in general is here.