The total compares to 4.5 million welcomed by the airport in Q1 2014.
Aircraft movements also rose to 41,585 (+16%) and cargo to 200,127 tonnes (+9.2%) during the first three months odf 2015.
Ahmad Al Haddabi, chief operations officer at Abu Dhabi Airports, said: “With more than 5 million passengers passing through Abu Dhabi International Airport during the first quarter, the statistics continue to show that Abu Dhabi is rapidly becoming a major global transportation hub.
"Only last month, we saw Alitalia and South African Airways add daily services between Abu Dhabi and Venice and Johannesburg while Jet Airways resumed daily flights between Abu Dhabi and Pune, Ahmedabad and Bangalore.
"Abu Dhabi Airports has made great progress in matching the growth in passenger traffic with a carefully implemented programme to expand capacity.
"During Q1, we opened the newly expanded facilities at Terminal 1 and we continue to push ahead with a broader capacity enhancement programme to ensure that passengers using Abu Dhabi International Airport will always enjoy a world class experience.”
The top five routes from Abu Dhabi International Airport during March were Bangkok, Manila, London Heathrow, Doha and Jeddah.
Within the next five years, over 40 million passengers are expected to use Abu Dhabi International Airport as their origin, destination or transit point for international and domestic flights.
The Midfield Terminal Building (MTB), Abu Dhabi Airports’ iconic expansion project, is being constructed to handle increasing passenger traffic.
The project features passenger and cargo facilities, duty free shops and restaurants for an initial capacity of 30 million passengers per year.