An 11-year-old girl in Malmesbury was approached on her way from school earlier this week.
On Tuesday afternoon, the girl was approached by a woman who asked her about her school uniform.
She wasn't injured but was unnerved by the incident.
A Wiltshire Police spokesman said: “We are investigating a report of a suspicious incident in Malmesbury where a teenage girl was approached by a woman.
“The woman is described as white, between 35 and 45 years old, with shoulder-length dark wavy or curly hair.
"She was in a dark-coloured small vehicle, possibly a Ford.
“Anyone with information should call Wiltshire Police on 101, quoting reference 54190087683.
Alternatively you can call Crimestoppers anonymously on 0800 555111.”
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