Boleslaus II (Boleslav II, Boleslaw II, Bolesław II) may refer to:
Boleslaus II, Duke of Bohemia (died 999) Bolesław II the Bold (c. 1041 or 1042–1081 or 1082) a.k.a. Boleslaw II the Generous, Duke of Poland 1058–1076 and King 1076–1079 Bolesław II the Horned (c. 1220/5–1278) a.k.a. Bolesław II the Bald, Duke of Kraków in 1241, of Southern Greater Poland 1241–1247, and of all Silesia–Wrocław 1241–1248 Bolesław II of Masovia (c. 1251–1313), a.k.a. Bolesław II of Plock Bolesław II, Duke of Cieszyn (c. 1425/28–1452)
See also Boleslaus (disambiguation), other kings of this name