A single subject experimental design (alternating treatment design) was used to compare the effects of Mulligan method and electrotherapy on the pain and limitation of range of motion in patients with frozen shoulder. In the Mulligan method sessions, the physiotherapist performed a posterior and caudal glide on the patient while the patient was performing shoulder flexion and abduction. In the electrotherapy sessions, the patient received ultrasound and interference current treatments. Mulligan method and electrotherapy were alternately performed on each patient. Pain was measured by visual analogue scale (VAS) and range of motion (ROM) was measured by modified finger ladder. The results showed that both Mulligan method and electrotherapy were effective in pain reduce and ROM increase, but Mulligan method was superior to electrotherapy in ROM increase while electrotherapy was superior to Mulligan method in pain reduce.