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Behaviours that challenge (BtC) are common in people with intellectual disability (ID) and associated with negative long-term outcomes. Reliable characterisation of BtC and behavioural function is integral to person-centred interventions. This systematic review and meta-analytic study quantitatively synthesised the evidence-base for the internal consistency, inter-rater reliability, and test-retest reliability of measures of BtC and behavioural function in people with ID (PROSPERO: CRD42021239042). Web of Science, Embase, PsycINFO and MEDLINE were searched from inception to March 2024. Retrieved records (n = 3691) were screened independently to identify studies assessing eligible measurement properties in people with ID. Data extracted from 83 studies, across 29 measures, were synthesised in a series of random-effects meta-analyses. Subgroup analyses assessed the influence of methodological quality and study-level characteristics on pooled estimates. COSMIN criteria were used to evaluate the measurement properties of each measure. Pooled estimates ranged across measures: internal consistency (0.41–0.97), inter-rater reliability (0.29–0.93) and test-retest reliability (0.52–0.98). The quantity and quality of evidence varied substantially across measures; evidence was frequently unavailable or limited to a single study. Based on current evidence, candidate measures with the most evidence for internal consistency and reliability are discussed; however, continued assessment of measurement properties in ID populations is a key priority. • Many measures of behaviours that challenge (BtC) and behavioural function exist. • The quality and quantity of evidence for measure IC, IRR and TRTR is variable in intellectual disability populations. • BtC measures with the most evidence for IC, IRR and TRTR are the ABC irritability scale, BPI-01 and BPI-Short Form. • Behavioural function measures with the most evidence for IC, IRR and TRTR are the FACT, QABF, and QABF-Short Form. [ABSTRACT FROM AUTHOR]