Five people, including a six-month-old baby, have been found after they were missing in the Grampians National Park.

Police said two women, two men and the young child set off at about 11am on Thursday from a home in Hamilton but their destination and travel plans were unclear.

They were told the five, who are all related, had possibly planned to spend the day at the Grampians National Park near Dunkeld.

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It appeared they planned to return home as there was food left in the slow cooker at home.

It is believed they did not have any camping gear or food with them.

The air wing, State Emergency Services and Parks Victoria helped police with the search.