This essay provides a general introductory survey of Iranian and Iran-related studies in the United Kingdom in the twentieth century (including languages, literature, and the arts), with a very brief preliminary foray into earlier Iran-related scholarship and wide-ranging imaginations of Iran in Britain and Ireland, as well as some concluding remarks on contemporary knowledge production about Britain in Iran. Among other themes covered in the essay are the varied contributions of non-Britons and non-Irish to Iran-related scholarship and imaginations in the United Kingdom, underscoring the overall transnational production, dissemination, reception, and utilization of knowledge (history, geography, archaeology, cultures, ethnography and anthropology, art and architecture, Iran-related Persian-language literatures and poetry, etc.). In particular, the essay highlights the contributions made by individuals from, and institutions in, the Indian subcontinent to “British” scholarship and knowledge about Iran.