Horia Tecău (Romanian pronunciation: [ˈhori.a teˈkəw]; born January 19, 1985) is a Romanian former professional tennis player who specialised in doubles.

He is a three-time Grand Slam champion, having won the 2015 Wimbledon Championships and 2017 US Open alongside Jean-Julien Rojer in men's doubles, as well as the 2012 Australian Open with Bethanie Mattek-Sands in mixed doubles. Tecău also reached five further Grand Slam finals: at the 2010, 2011 and 2012 Wimbledon Championships with Robert Lindstedt in men's doubles, and at the 2014 and 2016 Australian Opens in mixed doubles.

He reached his career-high doubles ranking of world No. 2 in November 2015, shortly before winning the 2015 ATP Finals with Rojer. Tecău won 38 doubles and one mixed doubles titles on the ATP Tour, including three at Masters 1000 level. He also won the silver medal at the 2016 Olympic Games in Rio de Janeiro, alongside compatriot Florin Mergea.

On January 16, 2010, Tecău won his first ATP doubles title at the Auckland Open, partnering Marcus Daniell.

He showed strong form in early 2010 and won two doubles titles, (one Challenger and one ATP World Tour 250 Series), at Marrakech and Casablanca, which confirmed his good form.

He won his third doubles title at 's-Hertogenbosch and his second with partner Robert Lindstedt (his first with him came in Casablanca).

At Wimbledon, Tecău reached, for the first time in his career, a Grand Slam doubles final. He and his partner, Robert Lindstedt, defeated the pair of Tommy Robredo and Marcel Granollers in four sets in the quarterfinals and in the semifinals the duo of Juan Ignacio Chela and Eduardo Schwank. In the final, Tecău and Lindstedt were defeated by the pair of Jürgen Melzer and Philipp Petzschner.

At Wimbledon in the mixed doubles, he and his partner, fellow Romanian Monica Niculescu, lost in the second round to Marcelo Melo and Rennae Stubbs.