["Criminal Behaviour and Mental Health, Volume 32, Issue 2, Page 138-147, April 2022. ", "\nAbstract\n\nBackground\nProbation officers tend to hold stigmatising attitudes towards individuals on their caseload with mental illnesses. This can result in poor outcomes for justice‐involved people with mental illnesses. Though anti‐stigma interventions in the general public and among other criminal–legal professionals hold promise, these interventions have not been tested among probation officers.\n\n\nAims\nTo measure levels of stigma towards mental illnesses among probation officers before and after a brief online training related to mental illness.\n\n\nMethods\nTwo hundred and seventy‐five probation and parole officers in one Midwest state completed a three‐module online training programme designed to increase knowledge and skills for working with clients with mental illnesses. Officers completed a pre‐ and post‐training assessment of level of stigmatising attitudes towards individuals with mental illnesses.\n\n\nResults\nOfficer levels of stigma statistically significantly decreased from pre‐test (8.22) to post‐test (7.37; p < 0.001, t = 6.13). Nevertheless, pre‐training stigma scores were the strongest predictor of stigma levels at post‐test (p < 0.001, b = 0.90).\n\n\nConclusions\nWhile basic training can significantly decrease mental disorder stigmatising scores for probation officers, the practical effect of this brief online experience was very small. Nevertheless, the fact that such brief and generalised input can have impact at all is encouraging. Implementation could be a useful preliminary to improving the quality of probation supervision of clients with mental illnesses.\n\n"]