Mechanical neck pain merupakan tipe nyeri leher yang mencakup kondisi minor strain/sprain pada otot danligamen serta disfungsi facet joint. Dalam melakukan evaluasi, diperlukan alat ukur yang dapat mengevaluasi secaraInternational Classification of Functioning, Disability, and Health (ICF). Tujuan dari penelitian ini adalah untukmengetahui nilai validitas dan reliabilitas modifikasi northwick park neck pain questionnaire (NPNPQ) pada mechanicalneck pain. Metode penelitian yang digunakan dalam penelitian ini adalah metode observasional analitik. Populasiterjangkau dalam penelitian ini adalah individu yang terdiagnosa secara klinis mechanical neck pain di praktik mandirifisioterapi di kota Denpasar dan Badung. Jumlah sampel dalam penelitian ini adalah 45 subjek. Penelitian inimengevaluasi nilai content validity, construct validity, dan internal consistency. Berdasarkan hasil uji analisis datadidapatkan nilai item-level CVI dari 3 asesor sebesar 1 dengan average congruency percentage (ACP) sebesar 93%.Sedangkan untuk contruct validity didapatkan nilai (p<0,05) dengan r hitung>r tabel pada semua butir pertanyaankuesioner, maka seluruh pertanyaan valid. Dan nilai internal consistency didapatkan hasil cronbach’s alpha 0,716 ataukesembilan butir pertanyaan adalah reliabel. Berdasarkan hasil penelitian di atas, dapat disimpulkan bahwa penerapanmodifikasi northwick park neck pain questionnaire versi Indonesia dalam mengukur disabilitas leher pada mechanicalneck pain adalah valid dan reliabel. Kata kunci: validitas, reliabilitas, modifikasi northwick park neck pain questionnaire, mechanical neck pain ; Mechanical neck pain is a type of neck pain that includes minor strain/sprain in the muscles, ligaments, or facet joint dysfunction. In conducting an evaluation, a physiotherapist need an outcome measure that is capable toevaluate according to International Classification of Functioning, Disability, and Health (ICF). The purpose of this studywas to determine the value of validity and reliability of northwick park neck pain questionnaire (NPNPQ) in mechanicalneck pain. The research method used in this study is an analytical observational method. Population in this study wereindividuals who complained or diagnosed clinically with mechanical neck pain in physiotherapy practices at Denpasarand Badung area. The number of samples in this study were 45 subjects. This study evaluates the value of contentvalidity, construct validity, and internal consistency. Based on the results of the data analysis test the CVI item-levelvalue of 3 assessors was 1 with an average congruency percentage (ACP) of 93%. While for the contruct validity, withthe value of (p <0.05), then all questions are valid. And the internal consistency value is obtained by cronbach's alpha0.716 or the nine questions are reliable. Based on the results of the above research, it can be concluded that theapplication of the modified version of northwick park neck pain questionnaire in measuring neck disability in mechanicalneck pain is valid and reliable.Keywords: validity, reliability, modification of northwick park neck pain questionnaire, mechanical neck pain