The 1999 European Parliament election was the United Kingdom's part of the European Parliament election 1999. It was held on 10 June 1999. Following the European Parliamentary Elections Act 1999, it was the first European election to be held in the United Kingdom where the whole country used a system of proportional representation. In total, 87 Members of the European Parliament were elected from the United Kingdom across twelve new regional constituencies.

The 1999 European Parliament election was a European election for all 626 members of the European Parliament held across the 15 European Union member states on 10, 11 and 13 June 1999. The voter turn-out was generally low, except in Belgium and Luxembourg, where voting is compulsory and where national elections were held that same day. This was the first election where Austria, Finland and Sweden voted alongside the other member states, having joined in 1995 and voted separately. The next election was held in 2004.