The authors report the development and validation of the Writing Dispositions Scale (WDS), a self-report instrument for measuring affective stances toward writing. The authors collected survey data from 854 elementary and middle school students and randomly split the data to facilitate both an exploratory factor analysis (EFA) and a confirmatory factor analysis (CFA). The findings of the EFA demonstrated that an 11-item WDS has desirable internal and content reliability and discriminant validity. The CFA supported the item selection of the EFA and demonstrated excellent factorial validity and reliability. The analyses confirmed that writing dispositions are related to 3 affective stances: confidence, persistence, and passion toward writing.