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The objective of this systematic review is to examine the literature that has investigated the impact of code-switching on language processing, and to identify whether its influence differs across methodologies, and how participant- and item-level factors may affect this. Early research focused on code-switching production and the associated reaction-time costs in cued language-switching tasks. Although some work on code-switched reading and spoken language processing has identified similar costs, recent work has suggested that such costs are absent for common code-switches and among frequent code-switchers. This review aims to synthesise these findings to understand whether code-switching hinders or benefits reading and spoken language processing. It also investigates whether these costs or benefits may depend on the study design, the switches participants are exposed to, as well as the language or code-switching background of the participants. This review will be focused on non-clinical bilingual populations, with no age range of participants or date range of studies imposed. Three databases will be searched: Web of Science, SCOPUS, and PsychInfo. Studies included must be experimental where participants are either exposed to unilingual and code-switching stimuli, or to different types of code-switching stimuli, and must include a numeric outcome measure that assesses the impact of code-switching on participants’ language processing. Studies only investigating code-switching production or only investigating code-switching’s impact on language control will be excluded. This protocol is based on the JBI methodology for systematic reviews and the PRISMA-P checklist.