Bassein

Bassein may refer to:

India

 * Vasai, a city in Maharashtra state, India; known as Bassein during Portuguese rule
 * Treaty of Bassein (1534)
 * Treaty of Bassein (1802)
 * Military history of Bassein
 * Vasai Assembly constituency
 * Bassein Fort, a colonial fort in Vasai built by the Portuguese
 * HMS Littleham (M2707), Indian Navy ship; formerly known as HMS Littleham (M2707)
 * Battle of Bassein, part of Maratha Portuguese war; also known as Battle of Vasai

Myanmar (Burma)

 * Pathein, the capital city of Ayeyarwady Division, Myanmar; formerly known as Bassein
 * Pathein Airport, airport in Pathein, Myanmar; formerly known as Bassein Airport
 * Roman Catholic Diocese of Pathein, formerly known as Roman Catholic Diocese of Bassein
 * Uzana of Bassein, heir-presumptive of the throne of the Kingdom of Pagan
 * Pathein Township, township in Myanmar; formerly known as Bassein West Township
 * Pathein River, a distributary of the Yangon River in Burma; formerly known as Bassein River