In this chapter, we critically review experiments on morphological processing focusing on compounds, derived and inflected words. Two main types of experiments are presented, those with single word or priming paradigms and those involving sentence processing, while focusing on morphological properties of words. We present as much cross-linguistic data as possible, in order to extract commonalities in morphological processing found across languages.Furthermore, studies on second-language learners, and occasionally early bilinguals, as well as child language development are presented, as they provide interesting data on differences and changes in brain behavior relating to morphological processing. Following this we discuss domains of further research while highlighting issues in data interpretation for present and future studies, in the hopes that readers will be encouraged to develop innovative research paradigms for the study of morphological processing.