218 Linguistik Terapan 19 (3) (2022): 218-226 Jurnal Linguistik Terapan Pascasarjana Available online http://jurnal.unimed.ac.id/2022/index.php/JLT-Unimed THE INTERPERSONAL FUNCTION OF PRESIDENT JOKO WIDODO'S SPEECH AT THE COP26 SUMMIT IN GLASGOW Rina Mulya Dina Sartika English Applied Linguistics Study Program Postgraduate Program-Universitas Negeri Medan Submitted September; Accepted October; Published December ABSTRACT This study addresses Mood Types of interpersonal function and the realization of speech function in Mood types. Language has its own speech function to provide, to elicit, to influence, and to initiate information and also the way how it's implemented. This function can be analyzed through an interpersonal function using the principal grammar system; Mood. This study is categorized as qualitative research. It aimed to find out the Mood Types, the realization of speech function in Mood Types, and the action of the illocutionary act that was performed behind the language in President Joko Widodo’s speech at the COP26 summit in Glasgow. The findings showed that there are 3 Mood types such; 18 (75%) for declarative, 4 (17%) for imperative, and 2 (8%) for interrogative. Also, the findings showed that the realization of speech functions in Mood types are statement, command, and question. In addition, the illocutionary acts found are representative, directive, commissive, and expressive. Keywords: Mood Types, Speech Function, Interpersonal Function, Illocutionary Act How to Cite: Mulya, Rina. (2022). The Interpersonal Function Analysis in President Joko Widodo's Speech at The COP26 Summit In Glasgow. Jurnal Linguistik Terapan Pascasarjana Unimed, 19 (3): 218-226. ISSN: 2407–7410 INTRODUCTION The term metafunction is derived from systemic functional linguistics and is thought to be a property of all languages. It asserts, as a functional linguistic theory, that the emergence of grammar, as well as the specific forms that grammars take, should be explained in terms of the functions that language evolved to serve (Halliday, 1994).