Mothers' attributions of self injurious behaviour (SIB) in their children with intellectual disability have been largely ignored. However, attributions may predict maternal well-being and engagement in treatment. Thirteen mothers of people who self-injured were recruited. A qualitative design was employed, the data being subjected to thematic analysis according to Braun & Clarke's (2006) guidelines. Weiner's (1980) attributional model informed development of semi-structured interviews, to explore the nature and content of their views about SIB. The mothers' attributions were consistent with dimensions of locus of cause, stability and controllability. They held different, sometimes contradictory views about causes of SIB. Although pessimistic regarding long-term improvement and often uncomfortable with interventions suggested by professionals, some felt able to exercise limited control over their offsprings' SIB. Control was also linked to stress, and a sense of responsibility when there was inadequate support. Sensitive, effective professional support for individuals engaging in SIB requires collaboration with carers, and understanding carers' views and feelings.