To determine the acceptability and feasibility of acupuncture for the treatment of endometriosis-related chronic pelvic pain. A prospective, randomized controlled feasibility study. Outpatient setting in Sydney, Australia. Participants who were aged 18-45 years, had a confirmed laparoscopic diagnosis of endometriosis in the past 5 years, and had regular menstrual periods and mean pelvic pain scores ≥4/10. Sixteen acupuncture treatments delivered by registered acupuncturists using a standardized point protocol over 8 weeks, twice per week plus usual care compared with usual care alone. Primary outcome measures were feasibility, safety, and acceptability of the acupuncture intervention. Secondary outcomes were changes in self-reported pelvic pain scores, changes in quality of life as measured by the Endometriosis Health Profile (EHP-30), changes in descending pain modulation, and changes in systemic inflammation (plasma interleukin [IL-6] concentrations). Twenty-nine participants were eligible to participate, with 19 participants completing the trial. There was unequal withdrawals between groups; the acupuncture group had a withdrawal rate of 14% compared with 53% in usual care. Adverse events were uncommon (6.7%) and generally mild. A 1.9 point decrease in median nonmenstrual pain scores and a 2.0 decrease in median menstrual pain scores between baseline and end of trial were observed in the acupuncture group only. Improvements in all domains of the EHP-30 were seen in the acupuncture group, with no changes seen in usual care. There was no difference between baseline and end of treatment in IL-6 concentrations for either group. Acupuncture was an acceptable, well-tolerated treatment and it may reduce pelvic pain and improve quality of life; however, usual care was not an acceptable control group. ACTRN12617000053325. Prospectively registered January 11, 2017.