The hypotheses that introversion & the introverted-intuitive-feeling-perceiving type (Meyers-Briggs Type Indicator) are related to suicidal ideation & behaviours were examined. Analyses of data from 330 university students found 4 interactive suicidal behaviour risk models: introverted-perceiving (females); introverted-sensing-feeling (males); introverted-intuitive-perceiving (males); extraverted-intuitive-judging (males). Implications for risk assessment & intervention are discussed.