Imunisasi sangat penting untuk tubuh seseorang agar kebal dari penyakit. Imunisasi adalah suatu cara untuk meningkatkan kekebalan seseorang secara aktif terhadap suatu penyakit. Riset Kesehatan Dasar tahun 2018 menunjukkan cakupan imunisasi DPT- HB-HIB 3 tingkat nasional sebesar 61,3 %. Adapun di provinsi Aceh cakupan imunisasi DPTHB-HIB 3 sebesar 60,2 % (Litbangkes RI, 2018). Kabupaten Gayo Luwes cakupan imunisasi DPT-HB-HIB 3 sebesar 71.16 % dan tidak mencapai target nasional sebesar 92,5% dan presentase imunisasi DPT-HB-HIB di puskesmas Teragun Gayo Luwes sebanyak 74.4% (BPS Aceh. 2022). Tujuan untuk mengetahui faktor-faktor yang berhubungan dengan kelengkapan imunisasi dasar pada Baduta di Wilayah Puskesmas Terangun Kabupaten Gayo. Penelitian bersifat analitik dengan desain Cross Sectional, populasi semua ibu yang memiliki anak Bayi Dua Tahun di Puskesmas Terangun Kabupaten Gayo Lues yang berjumlah 161. Jumlah sampel dalam penelitian ini diambil dengan menggunakan rumus slovin sebanyak 62 orang. Penelitian di laksanakan di Puskemas Terangun Kecamatan Terangun Kabupaten Gayo Lues tanggal 14-18 Agustus 2023. Analisa data menggunakan uji chi square. Pengolahan data dengan editing, coding, data entry, tabulating, dan analisis data secara univariat bivariate. Diperoleh nilai p=0.004 untuk variabel pengetahuan dengan kelengkapan imunisasi dasar, diperoleh nilai p=0.000 untuk variabel pekerjaan ibu dengan kelengkapan imunisasi dasr, diperoleh nilai p=0.000 untuk variabel dukungan keluarga dengan kelengkapan imunisasi dasar. Terdapat hubungan antara pengetahuan, pekerjaan dan dukungan keluarga dengan kelengkapan imunisasi dasar pada baduta. Petugas kesehatan perlu meningkatkan intensitas promosi dan pendidikan kesehatan khususnya tentang pentingnya imunisasi dasar sejak ibu mengandung agar saat anak dilahirkan ibu mau memberikan imunisasi ke pada bayinya.Kata Kunci : Imunisasi, Faktor yang Berhubungan Immunization is very important for a person's body to be immune from disease. Immunization is a way to actively increase a person's immunity against a disease. Basic Health Research in 2018 showed that national level DPT-HB-HIB 3 immunization coverage was 61.3%. Meanwhile, in Aceh province, DPTHB-HIB 3 immunization coverage is 60.2% (Litbangkes RI, 2018). Gayo Luwes Regency DPT-HB-HIB 3 immunization coverage was 71.16% and did not reach the national target of 92.5% and the percentage of DPT-HB-HIB immunization at the Teragun Gayo Luwes health center was 74.4% (BPS Aceh. 2022). The aim is to determine the factors related to the completeness of basic immunization among Baduta in the Terangun Community Health Center Area, Gayo Regency. The research is analytical with a cross sectional design, the population of all mothers who have two year old babies at the Terangun Community Health Center, Gayo Lues Regency totaling 161. The number of samples in this study was taken using the Slovin formula as many as 62 people. The research was carried out at the Terangun Health Center, Terangun District, Gayo Lues Regency, 14-18 August 2023. Data analysis used the chi square test. Data processing by editing, coding, data entry, tabulating, and univariate bivariate data analysis. A value of p=0.004 was obtained for the knowledge variable with complete basic immunization, a value of p=0.000 was obtained for the mother's employment variable with complete basic immunization, a value of p=0.000 was obtained for the family support variable with complete basic immunization. There is a relationship between knowledge, work and family support and the completeness of basic immunization for young children. Health workers need to increase the intensity of health promotion and education, especially about the importance of basic immunization since the mother is pregnant so that when the child is born the mother is willing to provide immunizations to her baby.Keywords: Immunization, Related Factors