ObjectiveEvaluate the feasibility and acceptability of an online guided self-determination (GSD) program to improve diabetes self-management skills among young adults with type 1 diabetes (YAD). MethodsAn online program comprising seven structured interactive conversations was designed. A pre- and post- interventional study used a sequential, two-phase multiple method design. Phase one comprised a training program for diabetes educators (DEs). In Phase two YAD participated in program and completed pre- and post-surveys assessing motivation to self-manage, perceived competence in diabetes and communication with DEs. Both YAD and DEs provided a program evaluation. ResultsThe online GSD program was acceptable, feasible and effective in improving autonomous motivation in self-management and communication with DEs. Easy access and program flexibility were highly appreciated by both participant groups and perceived to assist YAD to stay motivated. ConclusionThe program had a significant impact on the diabetes self-management of YAD and was a feasible and acceptable way to engage and communicate with DEs. The GSD platform contributes to age appropriate and person-centred diabetes self-management. It can potentially reach geographically distanced populations, or with social circumstances or other barriers impeding in-person service provision.