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This paper sets out theoretical approaches to language that guide the authors' research in the field, but which have been under-represented in literature. As the English as a lingua franca field of enquiry grows, this article provides needed dialogue, consideration, and reflection over how we conceptualise our subject matter, our roles, and our rhetorical stances. This paper proposes the usefulness of considering the complexity of language, not as something that gets in the way of empiricism or clarity, but as something that makes ELF researchers perfectly positioned to investigate and contribute to wider understandings of language. Complexity theory is drawn upon as a conceptual tool that can be useful in guiding our thinking about the dynamic nature of language, which, in turn, is considered in relation to the reasons why language is complex, namely its roles in relation to practices and contextualisation. Having established our approaches to the complexity of the language in ELF scenarios, we propose implications for ELF researchers' treatment of speakers, language, and ideology.