This article seeks to identify whether employee perceptions of job quality are better in instances where an onsite union representative is present. It also seeks to identify whether the relationship between onsite representative presence and job quality is explained by employee perceptions of union collective voice. The analysis, based on a survey of union members in the UK finance sector, demonstrates that employee perceptions of several dimensions of job quality are better where an onsite representative is present, and that this can be explained by the higher perceptions of union collective voice that onsite representatives engender.