Latar Belakang: Persalinan dengan sectio caesarea sering menimbulkan ansietas pada ibu, yang dapat memperburuk intensitas nyeri pasca operasi karena hubungan kompleks antara ansietas dan persepsi nyeri. Tujuan penelitian ini untuk mengidentifikasi hubungan antara ansietas preoperasi dengan nyeri postoperasi pada pasien sectio caesarea di Ruang Nifas RSUD Kabupaten Klungkung. Metode: Penelitian kuantitatif dengan desain analitik korelatif dan pendekatan cross sectional. Populasi dalam penelitian adalah pasien sectio caesarea di Ruang Nifas RSUD Kabupaten Klungkung, dengan sampel sebanyak 90 pasien yang dipilih menggunakan teknik purposive sampling berdasarkan kriteria inklusi. Penelitian dilakukan pada bulan Februari-April 2025 dengan pengumpulan data menggunakan kuesioner The Amsterdam Preoperative Anxiety and Information Scale (APAIS) dan Numeric Rating Scale (NRS). Data dianalisis menggunakan uji Spearman rho karena distribusi data tidak normal. Hasil: Hasil penelitian menunjukkan bahwa sebagian besar responden mengalami ansietas berat preoperasi dan nyeri sedang postoperasi. Terdapat hubungan yang sangat signifikan antara ansietas preoperasi dan nyeri postoperasi pada pasien sectio caesarea (p value

Background. Caesarean section often causes anxiety in mothers which can worsen the intensity of post-operative pain due to the complex correlation between anxiety and pain perception. Aim. To determine the correlation between pre-operative anxiety and post-operative pain in caesarean section patients in the Postpartum ward Klungkung General Hospital. Method. The study employed quantitative method with correlational analytic design and cross-sectional approach. The population in the study were caesarean section patients in the Postpartum ward of Klungkung General Hospital. There were 90 patients recruited as the sample through purposive sampling technique based on inclusion criteria. The study was conducted in February-April 2025. The data were collected using The Amsterdam Preoperative Anxiety and Information Scale (APAIS) and Numeric Rating Scale (NRS) questionnaires. Further, data were analyzed using the Spearman Rho test because the data distribution was not normal. Finding. The findings showed the majority of respondents experienced severe pre-operative anxiety and moderate post-operative pain. There was very significant correlation between pre-operative anxiety and post-operative pain in patients with cesarean section (p value