Tiago David Janeiro Caeiro (born 29 March 1984) is a Portuguese professional footballer who plays for C.F. Os Belenenses as a forward.
Born in Vila Franca de Xira, Lisbon District, Caeiro played in the lower leagues until the age of 27. In the 2010–11 season, he scored 11 goals for Atlético Clube de Portugal to help the club return to the Segunda Liga after a lengthy absence, then proceeded to net a further six in ten games to kickstart the following campaign.
In the 2012 summer, Caeiro signed for neighbouring C.F. Os Belenenses, contributing with 13 goals in 30 matches as his team returned to the Primeira Liga after three years. He made his debut in the Portuguese top flight on 21 September 2013, aged 29, playing 60 minutes in a 1–0 home win against C.S. Marítimo.
During a league fixture at Gil Vicente F.C. in April 2014, Caeiro suffered a thigh injury that nearly ended his career, but eventually recovered fully. On 17 May 2015 he scored his first goal of the season, the 1–1 home draw against FC Porto meaning that S.L. Benfica were automatically crowned champions after a goalless tie at Vitória de Guimarães.