We examined homeless people's self-reported interactions with police and paramedics in Toronto, Canada, and their level of trust in these emergency service providers. In a sample of 160 shelter users, 61% had interacted with police in the last 12 months, and 37% had interacted with paramedics (P=.0001). The proportion of subjects who expressed willingness to call police in an emergency was significantly lower than those willing to call paramedics in an emergency (69% vs. 92%, P=.0001). On a Likert scale ranging from a minimum of 0 to a maximum of 5, trust levels were lower in police than in paramedics (median level 3 vs. S, P=.0001).