A factory, manufacturing plant or a production plant is an industrial facility, often a complex consisting of several buildings filled with machinery, where workers manufacture items or operate machines which process each item into another. They are a critical part of modern economic production, with the majority of the world's goods being created or processed within factories.

कारखाना या 'निर्माण इकाई' उस औद्योगिक भवन को कहते हैं जहाँ कर्मचारी कोई सामान बनाते हैं या उन मशीनों का संचालन करते हैं जो किसी एक वस्तु को संस्कारित करके दूसरी उपयोगी वस्तु में परिवर्तित करती हैं।