Mahendra Singh Dhoni or MS Dhoni (born July 7, 1981 in Ranchi, Jharkhand) is an Indian cricketer and the current captain of the Indian Twenty20 and ODI team. Under his captaincy, India won the 2007 ICC World Twenty20.

Dhoni is an aggressive right-handed batsman and wicket-keeper. Dhoni is one of the wicket-keepers who have come through the ranks of junior and India A cricket teams to represent the national team - Parthiv Patel, Ajay Ratra and Dinesh Karthik being the others. Dhoni, referred to as 'Mahi' by his friends, debuted in the Bihar cricket team during the 1998/99 cricket season and was selected to represent India-A for a tour to Kenya in 2004. Along with Gautam Gambhir, Dhoni made multiple centuries against the Pakistan-A team in a tri-nation series and was selected in the Indian national team later in that year.

Dhoni scored 148 against Pakistan in his fifth ODI match in 2005 - then the highest score by an Indian wicketkeeper. Later in the year, he broke his own record as well as set the current world record for the highest score in the second innings in ODI matches as he scored 183* against Sri Lanka. Dhoni's success in the limited overs format secured him a place in the test team and coincidentally he made his maiden test century in his fifth Test match, when he scored 148 against Pakistan. Consistent performances in ODI cricket through the end of the 2005/06 season saw Dhoni ranked as the No. 1 batsman in the ICC ODI ratings briefly.

Dhoni's form dipped through 2006 as India lost matches at the ICC Champions trophy, DLF Cup, away bilateral series against West Indies and South Africa. A return to form in the home series against West Indies and Sri Lanka in early 2007 proved to be an inaccurate indicator of Dhoni's form as India crashed out of the first round in the 2007 Cricket World Cup. Dhoni was out for duck in both India's losses. After the World Cup, Dhoni won the Man of the series award in the bilateral ODI tournament against Bangladesh. For the tour of England, Dhoni was named the ODI team vice-captain.

A powerful hitter of the ball, Dhoni has shown the maturity to restrain his aggressive nature and play a responsible innings when the situation requires. Apart from traditional shots, Dhoni has two very unorthodox but effective cricket strokes. Since his entry into the Indian cricket team, Dhoni's aggressive batting style, success on the field, personality, and long hair have made him one of the most marketable cricketers in India.