António Reginaldo Matias de Araújo (2 October 1977 – 11 January 2016), or simply Reginaldo Araújo, was a Brazilian footballer who played at right-back.^[1]

Starting his career at Matsubara, Araújo joined Coritiba in 1997.^[2] Having success at Coritiba, he was called up by Brazil U-23 team challenging for a spot in the squad that played the 2000 Olympic Games.^[3] He joined São Paulo in 2001, but after an unsuccessful year, he returned to Coritiba in 2002.

Araújo was signed by Santos, who were the current national champions. He was a 2003 Copa Libertadores runner-up and was sent off in the first leg of the final against Boca Juniors.^[4] He moved to Flamengo in 2004, where he was a 2004 Copa do Brasil runner-up.^[5]

He later had spells at Noroeste and Santa Cruz before a spell in Portugal with S.C. Beira-Mar.^[6] Reginaldo Araújo moved back to Brazil to play for Criciúma and returned to Paraná state in his last career years.

He retired in 2010 after discovering a heart condition^[7] and worked with the youth team and as a director of football at Corinthians Paulista^[8] and was appointed as an assistant manager of PSTC in December 2015.^[9]

On 11 January 2016, he died after suffering a heart attack during a training of PSTC.^[10][11]