Police have released a photo of a man they want to speak to in relation to the flashing of a female jogger at a Melbourne park last month.

The woman, aged in her 40s, was jogging at Ruffey Lake Park in Doncaster on April 18 when she spotted a man sitting on a bench.

As she ran past him he allegedly exposed his genitals to her.

The woman then ran back and snapped a photo of the alleged offender, which she shared with police.

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The man did not threaten the woman or follow her.

Victoria Police have released a photo in a bid to identify the man.