{The Microsoft founder once again beat Mexican businessman Carlos Slim to the top spot. }
Mr Gates’ net worth rose by just over $3bn (£1.94bn) in the year to 13 February, to $79bn.
There are a record 1,826 billionaires in the world, Forbes said, an increase of 181 in the past 12 months.
Mr Gates has now been top of the list for 16 of the last 21 years, Forbes added.
Legendary US investor Warren Buffett regained third place in the list with a net worth of $72.7bn, from Amancio Ortega, the founder of Spanish fashion chain Zara.
Bill Gates has topped the world’s richest since 1995 to present.
Top 10 Forbes 2015 ranking of richest people:
1. Bill Gates $79.2bn
2. Carlos Slim Helu $77.1bn
3. Warren Buffett $72.7bn
4. Amancio Ortega $64.5bn
5. Larry Ellison $54.3bn
6. Charles Koch $42.9bn
7. David Koch $42.9bn
8. Christy Walton $41.7bn
9. Jim Walton $40.6bn
10. Liliane Bettencourt $40.1bn
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