Abstract While research on codeswitching and on ellipsis has flourished in the last two decades, ellipsis in codeswitching has not received as much attention. In this chapter, we argue that using ellipsis to study codeswitching is insightful on two fronts: first, codeswitching data offer a new proving ground against which to test extant theories of ellipsis. Second, ellipsis data ought to bear on theories of codeswitching, which have for the most part remained silent on it. The chapter first offers an overview of the literature on codeswitching. Then, we cover the work on ellipsis in codeswitching done so far. Our claim is that codeswitching points largely towards a structural condition on identity in ellipsis. Conversely, we find that the ellipsis data from codeswitching can be accounted for within a constraint-free approach to codeswitching, without having to further complicate the system.