Chief Constable Gary Roberts says one in five incidents police are called to involve people with mental health issues.
He was giving evidence to Tynwald's Social Affairs Policy Review committee on Friday when he made the claim.
Mr Roberts was asked whether the number of such incidents had fallen after police began working with other agencies.
He said so far there'd been no change, although he did expect the figure to fall in future:
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Ongoing incident involving emergency services at Ronaldsway Airport
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Chief Minister says government have been reminding people to 'buy Manx'
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Minister to be questioned on cigarette age restrictions
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Man denies dangerous driving allegations
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Hospitality body hits out at government
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