Portugal participated in the Eurovision Song Contest 1999 with the song "Como tudo começou" written by Tó Andrade and Jorge do Carmo. The song was performed by Rui Bandeira. The Portuguese broadcaster Rádio e Televisão de Portugal (RTP) organised the national final Festival da Canção 1999 in order to select the Portuguese entry for the 1999 contest in Jerusalem, Israel. The competition took place on 8 March 1999 where "Como tudo começou" performed by Rui Bandeira emerged as the winner following the votes from 11 regional juries.

The Eurovision Song Contest 1999 was the 44th edition of the Eurovision Song Contest, held on 29 May 1999 at the International Convention Centre in Jerusalem, Israel. Organised by the European Broadcasting Union (EBU) and host broadcaster Israel Broadcasting Authority (IBA), the contest was held in the country following its victory at the 1998 contest with the song "Diva" by Dana International, and was presented by Dafna Dekel, Yigal Ravid and Sigal Shachmon.