Aims and methodRecent funding from Welsh Government for mental health has helped to develop liaison psychiatry services in Wales. Systematic data collection was undertaken to map the liaison psychiatry services in Wales in collaboration with the Royal College of Psychiatrists in Wales and Public Health Wales 1000 Lives Improvement. A questionnaire was designed and circulated to all the health boards in Wales to gather information to map liaison psychiatry services in Wales. Up-to-date information was confirmed in January 2018, via email. RESULTS: Over the past 2 years, liaison psychiatry services have been set up in six out of seven health boards in Wales. Staffing levels have increased and the remit of services has broadened.Clinical implicationsMapping has highlighted that liaison psychiatry services in Wales continue to evolve. It will be important to continue to monitor these developments and their effects. Comparison with services in England will provide a useful comparison of service provision. A particular challenge will be to establish and monitor liaison psychiatry standards in Wales.Declaration of interestNone.