Bahasa Melayu is the official language of Malaysia , Indonesia ( though they call it Bahasa Indonesia ) , and Brunei . In Malaysia , the standard language is called Bahasa Malaysia `` Malaysian language '' . In Singapore , Brunei , southern Thailand , and the southern Philippines it is called Bahasa Melayu `` Malay language '' , and in Indonesia it has undergone series of standardizations and modifications to form what is now called as Bahasa Indonesia , `` Indonesian language '' , and furthermore designated as Bahasa Nasional `` National Language '' and Bahasa Persatuan\/Pemersatu `` Unifying Language\/Lingua Franca '' .