Xinyi, alternately romanized as Sunyi,[a] is a county-level city in Guangdong Province, China.

It is administered as part of the prefecture-level city of Maoming in the southwestern corner of the province,[3] bordering Guangxi to the west.

Though its metro area is much smaller with 418,731 inhabitants considered urban.

[1] Under the Qing, Xinyi County formed part of the prefecture of Gaozhou.

[2] After the Chinese Civil War, it was reorganized under Maoming.