Latar Belakang: Pertumbuhan penduduk yang tinggi merupakan masalah jika angka kelahiran masih tinggi dari angka kematian. Pemerintah menerapkan program keluarga berencana berupa IUD yang diharapkan mampu mengatasi masalah tersebut. Tujuan: Mengetahuifaktor-faktor yang berhubungan dengan minat WUS menggunakan IUD di Puskesmas Beru Kabupaten Sikka Nusa Tenggara Timur. Metode: Penelitian ini merupakan analitik observasional dengan pendekatan cross-sectional. Populasi dalam penelitian ini adalah WUS sebanyak 441 orang, menggunakan purposive sampling, sampel sebanyak 91 WUS yang memenuhi kriteria inklusi. Teknik analisa pengetahuan dan umur menggunakan spearman, pendidikan menggunakan chi square. Hasil:Sebagian besar responden dengan pengetahuan cukup sebanyak 54 WUS (59,3%), umur 20-35 tahun sebanyak 70 WUS (76,9%), pendidikan SMA/SMK sebanyak 67 WUS (73,6%). Hasil uji Spearman Rho dengan nilai p=0,0000,05 tidak ada hubungan antara umur dengan minat ibu menggunakan IUD. Hasil uji Chi-square p= 0,000

Background.High population growth is a problem if the birth rate is still higher than the death rate. The government implements a family planning program in the form of an IUD, which is expected to be able to overcome this problem.The purpose of this study was to determine the factors related to the interest of fertile women in using IUDs at Public Health Centre Beru, Sikka District, Nusa Tenggara Timur. Method.This study employed an observational analysis with a cross-sectional approach. The population in this study was 441 fertile-aged women. Purposive sampling was used to sample 91 fertile women who met the inclusion criteria. The analysis technique for knowledge and age used the Spearman Rho test, and education used the chi-square test. Results.Findings on the majority of respondents with 54 fertile women (59.3%) indicated sufficient knowledge, 70 fertile women (76.9%)aged 20-35 years, and 67 fertile women (73.6%)had a high school/vocational high school education. The results of the Spearman Rho test with a p-value of 0.000 < 0.05 showed a correlation between knowledge and the interest of fertile women in using IUD, p = 0.835 > 0.05; there was no correlation between age and the interest of mothers in using IUD. Keywords:Age, Education, Interest, IUD, Knowledge