Yvoir (French pronunciation: [i.vwaʁ]) is a Walloon municipality located in the Belgian province of Namur. On 1 January 2006 the municipality had 8,450 inhabitants. The total area is 56.84 km², making it a population density of 149 inhabitants per km². The municipality consists of the villages Dorinne, Durnal, Evrehailles, Godinne, Houx, Mont, Purnode, Spontin and Yvoir.
Yvoir was the host city of the 1975 UCI Road World Championships
, the Bocq river alongside the south wing of the communal house.