Strengths-based approaches are growing in popularity in coaching. To contribute to the evidence for their effectiveness we conducted a field study with random allocation to investigate the impact of a short bespoke strengths-based group coaching intervention on self-efficacy confidence in goal confidence and strengths knowledge. We expected the coaching condition to improve more on these measures compared to a non-intervention control condition at time two. Thirty-two student participants were assigned to either a coaching group who set a goal and undertook a group coaching session or a control group who set goals but did not receive coaching. There was a significant increase in self-efficacy (t(15) = −5.437 p < .001 r = 0.92) and confidence in goal attainment (Z = −3.51 p < .001 r = 0.62) between the pre- and post-coaching scores for participants in the coaching condition. However the comparison to the control group was not statistically significant. Our discussion suggests that future longitudinal research is needed to tease out the potential mechanisms of strengthsbased coaching further for instance considering individual differences influencing goal setting in the first place and also strengths use as well as strengths knowledge.