‘Lexical bundles’ as a category of word combinations are words which follow each other more frequently than expected by chance. This corpus-based study attempts to compare the frequencies of three- and four-word lexical bundles in research articles of three disciplines: physics, computer engineering, and applied linguistics. Moreover, it aims to scrutinize them between native and nonnative research articles of applied linguistics to see whether Iranian authors who publish articles in English, use lexical bundles in the same way as native authors. To this end, three native corpora and a non-native corpus of research articles were collected, each including approximately one million words. All the analyses were conducted through Wordsmith Tools (Scott, 2010) and Hyland’s (2008) taxonomy of most frequent academic lexical bundles. The results show that there are relatively significant differences between the frequencies of the lexical bundles employed across the disciplines. In addition, they differ significantly between the native and nonnative articles of applied linguistics. It is also revealed that lexical bundles are realized differently across different disciplines and that non-natives do not follow the norms of natives appropriately. Findings can be used to improve writing in different disciplines and create more cohesive and coherent texts.