The psychometric properties and factor structure of a Welsh translation of the school short form of the Coopersmith Self-esteem Inventory (SEI-SSF), which is widely used as a measure of children's global self-esteem, was investigated among a sample of 681 pupils attending Welsh-medium primary schools in Wales. It has generally been assumed that the SEI-SSF does not allow the differentiation of different sources of self-esteem. This study demonstrated that the Welsh translation has adequate scale reliability and, after the removal of six redundant items, that exploratory and confirmatory factor analyses identified the presence of three clearly distinguishable factors of self-esteem derived from parents and peers respectively in addition to personal self-esteem. Among 8-11-year-old pupils parentally derived self-esteem and personal self-esteem are closely associated. (Contains 1 table. The school short form of the Coopersmith Self-esteem Inventory, Welsh-language edition is appended.)