Doriva, full name Dorival Guidoni Jr. (born 28 May 1972 in Nhandeara, São Paulo) is a retired Brazilian footballer who played midfielder, who last played for América-SP in the Brazilian league. From 2003 until 2006, he played for English Premier League club Middlesbrough, where he had previously been on loan.

Prior to joining to Middlesbrough, Doriva played for São Paulo, Atlético Mineiro, Porto, Sampdoria, and Celta Vigo. His transfer from Atlético to Porto cost $4 million.

Doriva was signed on loan by Middlesbrough manager Steve McLaren in January 2003. He made his debut on 5 April 2003 in a 3-0 home win over West Bromwich Albion.

After five appearances for the club, Doriva was given a one-year contract with Middlesbrough on 21 July 2003. In his first full season at Middlesbrough, Doriva was first choice in midfield alongside George Boateng. He found his chances limited after this, however, due to the emergence of Stewart Downing and the conversion of Boudewijn Zenden to central midfield. On 29 February 2004 Doriva started as Middlesbrough won their first major trophy, the 2004 Football League Cup Final, with a 2-1 win over Bolton Wanderers in the Millennium Stadium in Cardiff. His only goal for Middlesbrough came in a 2–1 victory at Notts County in the third round of the FA Cup on 8 January 2005.