BACKGROUND: Physical activity (PA) is important for people with stroke, but the reliability of PA questionnaires used in this population has been relatively unexplored. OBJECTIVE: To compare the internal consistency, test-retest, and absolute reliability of 3 commonly used PA questionnaires in adults with stroke. METHODS: Participants reported their PA levels twice, 2-3 days apart, using the Physical Activity Scale for Individuals with Physical Disabilities (PASIPD), International Physical Activity Questionnaire (IPAQ), and Global Physical Activity Questionnaire (GPAQ). Intraclass correlation coefficients (ICC RESULTS: Twenty-eight people (64.4 years, 50% female, 5.2 years post-stroke) participated. Internal consistency was acceptable for total scores on the IPAQ ( CONCLUSIONS: In adults with stroke, the IPAQ and GPAQ had adequate total-questionnaire internal consistency, and the GPAQ had acceptable domain-level internal consistency. When true change in PA did not occur, test-retest reliability was good for all questionnaires. We suggest clinicians and rehabilitation scientists can use any of the three questionnaires, but may consider the GPAQ due to acceptable internal consistency and test-retest reliability.