Objective: To examine the extent to which daily physical activity and social participation are associated with clinical measures of motor function, balance, balance self-efficacy, functional mobility, and walking speed and distance in community-dwelling people with stroke. Methods: In a cross-sectional study, the Chedoke-McMaster stroke assessment (CMSA; leg and foot scales), Berg balance scale (BBS), activities-specific balance confidence (ABC) scale, timed ‘up and go’ (TUG), 5-meter walk test (5mWT), 6-minute walk test (6MWT), and the stroke impact scale (SIS; participation scale) were used to measure lower extremity motor function, balance, balance self-efficacy, functional mobility, walking speed and distance, and participation, respectively. Daily physical activity was estimated using time spent upright during standing and walking measured over a five-day period with a uniaxial accelerometer (activP AL). Results: Fifteen men and two women participated. The mean ± standard deviation age and time post-stroke were 71.4 ± 9.7 and 2.0 ± 0.1 years, respectively. Time spent upright per day was 192 ± 141 minutes and SIS participation scores were 68 ± 21 points. ABC scale ratings and comfortable gait speed correlated with physical activity (rho=0.66 and 0.50, p=0.004 and 0.043, respectively) and participation (rho=0.62 and 0.48, p=0.007 and 0.049, respectively). Time spent upright and participation scores were also correlated (rho=0.66, p=0.004). Conclusions: Balance self-efficacy and comfortable walking speed are moderately associated with time spent standing and walking per day as well as social participation in ambulatory, community-dwelling people with stroke. The ABC scale and the 5mWT are recommended as interpretable measures of outcome in stroke rehabilitation with relevance to community living.