The aim of this research was to find the psychometric qualities of validity and reliability of the Dispositional Optimism Questionnaire, with a convenience sample of 608 participants aged 16 to 60, from diverse educational backgrounds, both genders, and residing in Bogota, Colombia. The content validity was performed with an ANGOFF methodology, the concurrent validity with the Life Orientation Test (LOT) and the reliability analysis with the Rasch model. The test was found to be reliable and psychometrically adequate. Even though the Cronbach’s alpha was not so high, the separation reported by the Rasch model was expected, an appropriate fit.