Ian James Poulter (born 10 January 1976) is an English professional golfer who plays in the LIV Golf League. He has previously been ranked as high as number 5 in the world rankings. The highlights of Poulter's career to date have been his two World Golf Championship wins at the 2010 WGC-Accenture Match Play Championship and the 2012 WGC-HSBC Champions, as well as being part of five Ryder Cup winning European teams. He is the touring professional for Woburn Golf and Country Club.

Born in Hitchin, and raised in Stevenage, Poulter took up the game at the age of four when his single-handicap father, Terry, gave him a cut-down 3-wood. His older brother Danny is also a professional golfer. Unable to get a place as a pro at a private club, he became the assistant pro and golf shop manager at the Chesfield Downs Golf Club. There he was forced by his boss to pay a full green fee every time he wanted to play in a competition. His handicap hence stayed at four, because he did not play in competitions. Following this period, Poulter joined as Assistant Pro at Leighton Buzzard golf course, giving lessons to youngsters at £1 per lesson. He is an avid fan of football club Arsenal.

In 1996, Poulter turned professional. He earned his first win at the 1999 Open de Côte d'Ivoire on the European Tour's second tier Challenge Tour. He won promotion to the European Tour itself via the qualifying school later that year. In his first season, he claimed the Italian Open title and was the Sir Henry Cotton Rookie of the Year for 2000. Further wins followed in each of the next four seasons, most prestigiously the season ending "tour championship" the Volvo Masters in 2004. He was in the top ten on the Order of Merit in 2003, 2004, 2006, 2009, 2010 and 2012. In 2013, he finished 2nd on the Order of Merit, his highest placing so far. After narrowly missing a place in the 2002 European Ryder Cup team, Poulter was a member of the victorious squad in 2004, where he officially scored the winning points for his team.

At the 2008 Masters Tournament, Poulter made a hole-in-one at the 16th hole at Augusta National in the first round. At the 2008 Open Championship, Poulter had the clubhouse lead on the last round before being beaten by defending champion Pádraig Harrington. In the 2008 Ryder Cup, Poulter was the highest points scorer on either side as he scored 4 of Europe's 11.5 points. Europe lost the Ryder Cup 16.5–11.5. In the 2009 Players Championship, he finished in sole possession of second place at eight under-par, four shots behind the winner, Henrik Stenson. In November 2009, Poulter won the Barclays Singapore Open at the Sentosa Club. He moved into the top-10 of the Official World Golf Ranking in January 2010 with a second-place finish at the Abu Dhabi Golf Championship.

In February 2010, he won his first tournament on U.S. soil, beating fellow Englishman Paul Casey 4&2 in the final of the WGC-Accenture Match Play Championship in Arizona. The win moved him to 5th in the world rankings. His ranking gained Poulter a place in the 2010 Ryder Cup in September at Celtic Manor in Wales He won 3 points in the 4 matches he played in the European team's win by 14.5 points to 13.5. In November 2010, he won his second title of the year with a one-stroke victory in the UBS Hong Kong Open.

On 23 February 2011, in Marana, Arizona, Poulter became the first defending champion in nine years to be eliminated in the first round of the WGC-Accenture Match Play Championship. He did however enjoy greater success in the European Tour's own match play event, the Volvo World Match Play Championship where he won the title beating Ryder Cup teammate Luke Donald, 2&1, in the final. He had previously beaten the world number one Lee Westwood, Francesco Molinari and Nicolas Colsaerts to get to the final. This was Poulter's second tournament win in a match play event and eleventh European Tour victory. Poulter was one of José María Olazábal's two "captains picks" for the European Team at the 2012 Ryder Cup. He won all the 4 matches he played over the three days of the event, and was a key figure in sparking his team's victory by 14.5 points to 13.5.

On 4 November 2012, Poulter won the second World Golf Championship of his career at the WGC-HSBC Champions in Shenzhen, China, coming from four strokes back in the final round to win by two from four other players. He shot a final round of 65 which included 8 birdies in his first 15 holes to seize control and despite a late bogey, closed out the victory by two strokes. He became only the second European to have won multiple WGC events, after Darren Clarke. The victory took Poulter to 15th in the rankings.

At the 2015 Honda Classic on the PGA Tour, Poulter had a three shot lead going into the final round of the rain delayed event. However he had a disastrous four-over-par final round of 74, where he found the water five times, included twice on the 14th hole which cost him a triple bogey. Poulter would finish in a tie for third, one shot outside of the playoff, which was won by Pádraig Harrington. It was his first 54-hole lead on the PGA Tour and he never would win a non-WGC PGA Tour event until 2018. In the same year, Poulter was in a predicament. He fell to 51st in the OWGR and was not exempt for the WGC-HSBC Champions, and had failed to enter the UBS Hong Kong Open. He was also at risk of losing his European Tour card since he had only played in 12 events, one short of membership and Ryder Cup eligibility. He only earned entry to the Hong Kong Open after Rich Beem gave up his sponsor exemption to allow Poulter to compete.