Aim: Psoriasis is a common, generically determined auto-inflammatory and proliferative skin disease of unknown origin. There has been enormous evidence indicating the positive and negative role of diet on several skin conditions including psoriasis. The study aims to design and validate a knowledge, attitude and practice (KAP) questionnaire to assess the level of dietary awareness, beliefs and practices about psoriasis among the psoriasis patients. Methods: A self-developed KAP questionnaire is validated through the expert input and piloting for construct and content analysis. Repeated amendments and validation 25, 34 and 35 questions were developed each for the domains of knowledge, attitude and practices to assess the nutritional awareness, attitude and practices among the patients suffering from psoriasis. Results: Using the literature review, Items with an I-CVI of >79% were retained. Items having CVR less than 0.59 (Lawshe method) were excluded. The inter-rater agreement (Kohen kappa) was maintained >0.7. The reliability analysis of the KAP questionnaire with Cronbach’s alpha for Knowledge, Attitude and Practices was measured at 0.75, 0.72, and 0.93 respectively showing acceptable internal consistency. a score of 3.46 out of 4 was recorded. Thus, the KAP questionnaire indicated an appropriate level of content validity and is supported by good reliability scores as well.