The article analyses the development and problematisation of the concept of “Islamophobia” in two interrelated spheres of British knowledge: parliamentary and academic. Drawing on the transcripts of the House of Lords and the House of Commons (1997-2024) and academic papers by leading British researchers (C. Allen, T. Modood, N. Mir, L. Mousavi, A. Vakil, K. Malik, etc.), the authors reveal that the absence of a normatively recognised definition keeps the term conceptually vague and complicates law enforcement practice. The government has refrained from utilising the term “anti-Muslim hatred”, instead highlighting the incongruity between the All Party Parliamentary Group's (APPG) definition and the provisions outlined in the Equality Act 2010, which could potentially impede the freedom of speech. The academic community, while acknowledging the structural nature of discrimination, simultaneously criticises the term for its tendency to conflate religious and racial markers. The article demonstrates that, despite a convergence in the assessment of institutional hostility towards Muslims within parliamentary and academic discourses, a divergence emerges in the resolution of terminology. The primary contribution of the article is the juxtaposition of parliamentary debates and academic frameworks, which reveals the discrepancy between political pragmatics and academic reflection.