Background: One of the primary goals of physical therapy during the early phases of stroke rehabilitation is to facilitate static and dynamic sitting. There is convincing evidence that trunk performance is an early predictor of functional outcome and also activities of daily living after stroke balance and selective trunk movements are remain impaired after stroke. Hence selective trunk training early in the rehabilitation process may result better improvement in sitting and functional mobility. Objective: To investigate whether provision of additional trunk training improves sitting balance following acute stroke. Design: A pilot randomized controlled trial. Setting: Department of Physiotherapy,Kasturba Medical College,Mangalore Participants: Twenty subjects having first ever unilateral stroke and who can able to sit on a stable surface independently for 30 seconds were recruited for the study. Intervention: Each participant was randomly allocated into a control (conventional physiotherapy) or experimental group (conventional therapy plus an additional session of trunk training). In addition to conventional physiotherapy subjects in the experimental group received a total 10 hours of individual and supervised trunk exercises for 45 minutes with adequate rest periods, 6 times a week, for 3 weeks. Outcome measures: Trunk Impairment Scale (TIS) and Brunel Balance Assessment (BBA) were used on admission to the study and at 3 week intervals following intervention by an blinded observer. Results: Following three weeks of intervention subjects in both groups had scores in Trunk Impairment Scale and Brunel Balance Assessment. Compare to control group participants completing additional trunk training in the experimental group had statistically significant difference in TIS and BBA scores (p< 0.05). Conclusions: This pilot study concludes that additional trunk training in acute phase of stroke rehabilitation improves sitting balance and mobility.