This paper provides a new first cause argument by showing that atomism, i.e. the thesis that each composite object is composed of simple objects, together with causalism, understood in this paper as the thesis that every object is a cause or has a cause, logically imply the existence of a first cause if some additional general premises regarding the interplay between parthood, composition and causation are accepted. Thus it is shown that a commitment to atomism, causalism and the additional premises (...) result in a commitment to there being a first cause. (shrink)