Pablo Carreño Busta (Spanish pronunciation: [ˈpaβlo kaˈreɲo ˈβusta]; born 12 July 1991) is a Spanish professional tennis player. He has been ranked as high as world No. 10 by the ATP, which he first achieved on 11 September 2017. He has won seven singles titles on the ATP Tour, including a Masters 1000 title at the Canadian Open, and achieved his best Grand Slam results at the US Open, reaching the semifinals of the 2017 and 2020 editions. Representing Spain, Carreño Busta has won an Olympic bronze medal in men's singles at the 2020 Tokyo Olympics (defeating world No. 1 Novak Djokovic en route) and was a member of the Spanish team that won the 2019 Davis Cup.

In doubles, Carreño Busta has won four titles and reached a career-high doubles ranking of No. 16 on 17 July 2017. His doubles career highlights include a runner-up finish at the 2016 US Open, partnering Guillermo García López, and a victory at the 2020 Cincinnati Masters, partnering Alex de Minaur.

Carreño Busta reached as high as No. 6 in the combined junior world rankings in February 2009.

His first appearance in an ATP Tour tournament was at the 2011 Barcelona Open, where he lost in the first round to Benoît Paire.

He has reached 18 singles finals competing in ITF Futures tournaments; and won eleven of these: one in 2009, one in 2010, three in 2011, and six in 2013. He also won two challenger titles from two finals in 2011, and at this point reached a career high singles ranking of no. 133. He missed the majority of the 2012 season due to injury, and underwent surgery on his back later that year. Carreño returned towards the latter stages of 2012, after five months of recovery, and played in four Futures tournaments to end the year, all in Morocco, although he did not progress past the semi-final stage in any. He ended the year with a singles ranking of No. 715.

After a strong start to the opening three months of 2013, winning 42 out of 43 matches on the ITF Circuit, Carreño Busta entered the qualification stage of the 2013 Grand Prix Hassan II in April, held in Casablanca, Morocco. He won his three qualifying matches, and then beat first seed and two-time Grand Prix Hassan II champion, Pablo Andújar, 6–4, 2–6, 6–3. He lost in the following round to eventual runner-up, Kevin Anderson. Later on that month, Carreño Busta reached the semi-final stage of the 2013 Portugal Open, again progressing through the qualification rounds, before losing to Stan Wawrinka in three sets.

Carreño Busta participated in his first ever Grand Slam tournament when he was a qualifier at the 2013 French Open. He won his three qualification matches, before losing to Roger Federer in straight sets in the opening round.

In April, Carreño Busta reached his second ATP final at ATP Estoril after defeating Benoît Paire. He was defeated in the finals by compatriot Nicolás Almagro. In August, he won his first ever ATP singles title at the 2016 Winston-Salem Open, defeating compatriot Roberto Bautista Agut in the final. He entered the top 40 of the ATP rankings for the first time as a result, becoming world No. 39.