Top 10 Richest people in the world

1. Carlos Slim Helú 71
he is a Mexican business magnate and philanthropist who has at various times been noted as the world's wealthiest person. He is the chairman and CEO of telecommunications companies Telmex and América Móvil and has extensive holdings in other Mexican companies through his conglomerate, Grupo Carso SAB, as well as business interests elsewhere in the world.
América Móvil, which at 2010 was Latin America’s largest mobile-phone carrier, accounted for around US$49 billion of his wealth by the end of 2010. His corporate holdings at February 2011 have been estimated at US$74 billion and from these estimates he is the wealthiest person in the world.

2.Bill gates 55

$56. Billion 
Microsoft  -United states

He is chairman of Microsoft, the software company he founded with Paul Allen. He is consistently ranked among the world's wealthiest people and was the wealthiest overall from 1995 to 2009, excluding 2008, when he was ranked third. During his career at Microsoft, Gates held the positions of CEO and chief software architect, and remains the largest individual shareholder, with more than 8 percent of the common stock.
 He has also authored or co-authored several books.
Gates is one of the best-known entrepreneurs of the personal computer revolution. Although he is admired by many, a number of industry insiders criticize his business tactics, which they consider anti-competitive, an opinion which has in some cases been upheld by the courts. In the later stages of his career

3.Warren Edward Buffett 80

$50.0 billion
Berkshire Hathaway United states
is an American investor, industrialist and philanthropist. He is widely regarded as one of the most successful investors in the world. Often called the "legendary investor, Warren Buffett", he is the primary shareholder, chairman and CEO of Berkshire Hathaway. He is consistently ranked among the world's wealthiest people. He was ranked as the world's wealthiest person in 2008
 and is the third wealthiest person in the world as of 2011.
Buffett is called the "Oracle of Omaha" or the "Sage of Omaha" and is noted for his adherence to the value investing philosophy and for his personal frugality despite his immense wealth.Buffett is also a notable philanthropist, having pledged to give away 99 percent of his fortune to philanthropic causes, primarily via the Gates Foundation. He also serves as a member of the board
 of trustees at Grinnell College.

4. Bernard Arnault 62

$41.0 billion
Bernard Arnault is a French businessman best known as the chairman and CEO of the French conglomerate LVMH, the largest luxury-products company in the world. According to Forbes Magazine, Arnault is the world's 4th and Europe's richest person, with a 2011 net worth of US$41 billion.

5.Lawrence Ellison 66

$39.5 billion
Oracle Corporation United States
Lawrence Ellison is an American business magnate, co-founder and chief executive officer of Oracle Corporation, a major enterprise software company. As of 2011 he is the fifth richest person in the world, with a personal wealth of $39.5 billion.

6 Lakshmi Mittal (60)

$31.1billion – Steel, India.
London’s richest resident oversees ArcelorMittal, world’s largest steel maker. Net profits fell 75% in 2009. Mittal took 12% pay cut but improved outlook pushed stock up one-third in past year. Looking to expand in his native India; wants to build steel mills in Jharkhad and Orissa but has not received government approval. Earned $1.1 billion for selling his interest in a Kazakh refinery in December
7 Amancio Ortega (74)

$31 billion
Fashion retail, Spain.
Style maven lords over Inditex; fashion firm, which operates under several brand names including Zara, Massimo Dutti and Stradivarius, has 4,500 stores in 73 countries including new spots in Mexico and Syria. Set up joint venture with Tata Group subsidiary to enter India in 2010. Betting on Florida real estate: bought Coral Gables office tower that is currently home to
Bacardi USA.
8 Eike Batista (53)

$30 billion
Mining, oil. Brazil.
Vowing to become world’s richest man–and he may be on his way. This year’s biggest gainer added $19.5 billion to his personal balance sheet. Son of Brazil’s revered former mining minister who presided over mining giant Companhia Vale do Rio Doce got his start in gold trading and mining.

9  Mukesh Ambani (53)

$27 billion- Petrochemicals, oil and gas. India.
Global ambitions: His Reliance Industries, already India’s most valuable company, recently bid $2 billion for 65% stake in troubled Canadian oil sands outfit Value Creations. Firm’s $14.5 billion offer to buy bankrupt petrochemicals maker LyondellBasell was rejected. Since September company has sold Treasury shares worth $2 billion to be used for acquisitions. Late father, Dhirubhai, founded Reliance and built it into a massive conglomerate.

10.Christy Walton (55)

26.5 Billions 
Walmart owner 
she is the 4th richest person in the United States according to Forbes Magazine and the 10th richest person in the world.[2] As of March 2011, she had an estimated net worth of US$ 26.5 billion, the bulk of which comes from her shares in Wal-Mart, but also from First Solar, in which her late husband invested. She is currently the richest woman in the world