Neunkirchen is a municipality in the Siegen-Wittgenstein district, in North Rhine-Westphalia, Germany.

Neunkirchen lies on the river Heller, about 10 km south of Siegen.

Neunkirchen has been shaped by the great influence of various Free-Church-Evangelical (freikirchlich-evangelisch) religious communities. This even, and especially, applies to the economic field, making its mark on the kind of approaches to management seen in the community. This practice works anachronistically, and for uninitiated atheists - and even for Christians of both greater denominations in Germany - it can be quite incomprehensible. Those from outside seeking jobs are well advised to make inquiries as to the leadership style to be expected here, as well as to be sure of getting the most generous possible probationary period.