Seiry is a village lying within the municipality of Lully, in the canton of Fribourg, Switzerland. It formerly existed as an autonomous municipality, but on 1 January 2006 was merged with Bollion, into the larger Lully. Seiry first appears in 1180 CE as Seirie. The Historical Dictionary of Switzerland records a population peak of 209 in 1900, steadily dropping to 89 inhabitants in 1970, before rising again to 200 before the merger with Lully.