Background: Second opinions have the goal of clarifying uncertainties around diagnosis or management, particularly when healthcare decisions are complex, unpleasant, and carry considerable risks. Second opinions might be particularly useful for people recommended surgery for their back pain as surgery has at best a limited role in the management of back pain. No studies have attempted to summarise the available evidence for second opinion services designed for people with back pain that have been recommended to have surgery.Methods: We conducted a scoping review. Two independent researchers screened PubMed, EMBASE and Cochrane CENTRAL from their inception to May 6th, 2021. Studies of any design were eligible provided that they described a second opinion intervention for people with spinal pain (low back or neck pain with or without radicular pain) either considering surgery or to whom surgery had been recommended. We assessed the methodological quality of studies with the Downs & Black scale. Outcomes were: i) characteristics of second opinion services for people considering or who have been recommended spinal surgery, ii) agreement between first and second opinions in terms of diagnoses, need for surgery and type of surgery, iii) their effectiveness in reducing surgery rates and improving patient –reported outcomes; and iv) the costs and healthcare use associated with these services. Outcomes were presented descriptively. Results: We included 12 studies (11 had poor methodological quality; one had fair). Studies described patient, doctor, and insurance-initiated second opinion services. Diagnostic agreement between first and second opinions varied from 53% to 96% across studies. Agreement for need for surgery between first and second opinions ranged from 0% to 83%. There is some very-low quality evidence that second opinion services may reduce surgery rates in the short-term, but it is unclear whether these reductions are sustained in the long-term or if patients only delay surgery. Second opinion services may reduce costs and some healthcare use (e.g. imaging), but might increase others (e.g. injections, prescription drugs). Conclusions: There is a need for high-quality studies to determine the value of second opinion services for reducing spinal surgery.