Hyon (French pronunciation: [jɔ̃]; Picard: Iyon) is a sub-municipality of the city of Mons located in the province of Hainaut, Wallonia, Belgium. It was a separate municipality until 1972. On 1 January 1972, it was merged into Mons.

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  The village seen from the summit of Mount Héribus.
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  Bridge/Dam on the river la Trouille (16th century).
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  Bridge/Dam.
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  Church Saint-Martin (1874-1876).
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  Remarkable hybrid plane of the common park.
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  The Tree of the Liberty - Common Lime planted in the end of the 18th century.