This research discussed the use of code-switching by a lecturer in a speaking skill class at English and Literature Department of UIN Alauddin Makassar. The purpose of this research was to identify types of code-switchingِusingِHoffman’sِ Theory and functions of code-switchingِusingِAppleِandِMuysken’sِtheoryِusedِ by a lecturer in a speaking skill class. This research used qu…