Karl Thomas Conny Johansson (pronounced [ˈtʊ̌mːas ˈjûːanˌsɔn]; born 24 March 1975) is a Swedish former professional tennis player and coach.

He also won a silver medal at the 2008 Beijing Olympics in men's doubles, partnering Simon Aspelin.

Even when he injured his right elbow while playing the Orange Bowl tennis championships 16s in 1991, he still reached the final, losing to Spain's Gonzalo Corrales.

In 2005, he made a comeback to become the first Swedish player to reach the semifinals at Wimbledon since Edberg in 1993, and only dropped a set en route, losing to 2nd seed Andy Roddick in a tightly contested four set match that lasted a minute under 3 hours, 7–6(8–6), 2–6, 6–7(8–10), 6–7(5–7).

Near the end of the season, Johansson won his 9th and last ATP tour title in St. Petersburg, defeating Nicolas Kiefer in straight sets.

At the 2008 Beijing Summer Olympics he reached the doubles final with Simon Aspelin, where he lost against the Swiss team of Roger Federer and Stan Wawrinka in 4 sets.