ObjectivesThe Solution Focused Brief Therapy in Post-Stroke Aphasia feasibility trial had four primary aims: to assess (1) acceptability of the intervention to people with aphasia, including severe aphasia, (2) feasibility of recruitment and retention, (3) acceptability of research procedures and outcome measures, and (4) feasibility of delivering the intervention by speech and language therapists.DesignTwo-group randomised controlled feasibility trial with wait-list design, blinded outcome assessors and nested qualitative research.SettingParticipants identified via two community NHS Speech and Language Therapy London services and through community routes (eg, voluntary-sector stroke groups).ParticipantsPeople with aphasia at least 6 months post stroke.InterventionSolution-focused brief therapy, a psychological intervention, adapted to be linguistically accessible. Participants offered up to six sessions over 3 months, either immediately postrandomisation or after a delay of 6 months.Outcome measuresPrimary endpoints related to feasibility and acceptability. Clinical outcomes were collected at baseline, 3 and 6 months postrandomisation, and at 9 months (wait-list group only). The candidate primary outcome measure was the Warwick-Edinburgh Mental Well-being Scale. Participants and therapists also took part in in-depth interviews.ResultsThirty-two participants were recruited, including 43.8% with severe aphasia. Acceptability endpoints: therapy was perceived as valuable and acceptable by both participants (n=30 interviews) and therapists (n=3 interviews); 93.8% of participants had ≥2 therapy sessions (90.6% had 6/6 sessions). Feasibility endpoints: recruitment target was reached within the prespecified 13-month recruitment window; 82.1% of eligible participants consented; 96.9% were followed up at 6 months; missing data <0.01%. All five prespecified feasibility progression criteria were met.ConclusionThe high retention and adherence rates, alongside the qualitative data, suggest the study design was feasible and therapy approach acceptable even to people with severe aphasia. These results indicate a definitive randomised controlled trial of the intervention would be feasible.Trial registration numberNCT03245060.