Botulinum toxin type A (BTXA) has been shown to be an effective treatment in reducing muscle tone and managing spasticity in poststroke patients. However, its effectiveness in improving function in lower limb spasticity has been more controversial. In this report, we present our findings in three cases of chronic stroke patients with lower limb spasticity wherein we examine the effectiveness of a 4-week intensive rehabilitation program following BTXA treatment. For each patient, BTXA was injected into spastic muscles of the affected lower limb and a rehabilitation program was provided for the patient in-hospital for 4 weeks. Before BTXA treatment (baseline) and at 2 and 4 week follow-ups after each treatment, the Stroke Impairment Assessment Set (SIAS), the Modified Ashworth Scale (MAS) and the Range of Motion (ROM) of the ankle, the 10 Meter Walking Test (10MWT), the 6 minutes walking distance (6MD), the Timed Up and Go Test (TUG), the Berg Balance Scale (BBS), and the Functional Independence Measure (FIM) were all assessed. In each patient, ankle MAS and ROM, 10MWT, 6MD, TUG, and BBS after 4 weeks improved from the baseline. Furthermore, the ankle MAS and ROM improved significantly within 2 weeks, as did the 10MWT and 6MD over the total 4 weeks. In conclusion, it is suggested that a better improvement of ambulation and balance, as well as spasticity, would be found with intensive rehabilitation following BTXA treatment for lower limb spasticity.