Vivian Delanova Nunuhitu Pengarang SEBASTIANUS FERNANDEZ Dosen Pembimbing 1 MARCELINUS YERI FERNANDEZ AKOLI Dosen Pembimbing 2 Sebastianus Fernandez Ketua Penguji Drs. Alexander H. Kabelen, MA Penguji 2 Marcelinus Akoli, S.Pd., M.Ling Penguji 1

This study explores the use of code-mixing and code-switching in Leonardo Edwin’s YouTube vlog "Pertama Kali Ke UW Sebagai Mahasiswa UW," aiming to identify the types of code-mixing and code-switching employed, investigate the situation of these codes, and examine the social and cultural factors influencing these linguistic choices. The study is guided by the following research questions: (1) What are the types of code-mixing and code-switching used by Leonardo Edwin in his vlog? (2) In what situations are code-mixing and code-switching used? Using Critical Discourse Analysis (CDA) as the methodological framework, the writer categorizes code-mixing into intra-sentential, intra-lexical, and pronunciation shifts, and code-switching into intra-sentential, inter-sentential, establishing continuity, and emblematic types. The study reveals that these bilingual practices serve as tools for constructing social identity, signaling cultural affiliation, and engaging the audience, while also reflecting broader societal power dynamics. This study contributes to understanding bilingual language use in digital media and its role in shaping online communication, cultural identity, and social relations in contemporary media spaces. Keywords : Code Mixing, Code Switching, Critical Discourse, Youtube