Libraria , Vol. 6, No. 2, Desember 2018 257 KOMUNIKASI INTERPERSONAL PUSTAKAWAN DAN PEMUSTAKA DI PERPUSTAKAAN UNIVERSITAS ISLAM NEGERI SUMATERA UTARA MEDAN Hildayati Raudah Universitas Islam Negeri Sumatera Utara, Medan, Indonesia hildayatiraudah@gmail.com Triana Santi Universitas Islam Negeri Sumatera Utara, Medan, Indonesia triana_santi@uinsu.ac.id Abstract Te research objective is to analyze librarian and library interpersonal communication in UINSU Medan. Tis study uses the efectiveness theory of interpersonal communication from Devito (1986). Tis research method uses qualitative research methods with a phenomenological study approach. Research informants were 5 (fve) librarians who worked in the UINSU library and 9 (nine) library users and through purposive sampling. Data collection techniques through observation, interviews, and documentation. Data analysis techniques use thematic analysis. Data triangulation was carried out to 9 (nine) students of UINSU Medan. Te results showed that UINSU Medan library librarians had efective interpersonal communication found in several components, namely: 1)Verbal and Nonverbal Communication, 2) Openness, 3) Receiving Input, 4) Hospitality, 5) Empathy, 6) Support , 7) Familiarity, 8) Positive Tinking, 9)