The pieces were handed over at a ceremony attended by Deputy Prime Minister Sok An and US diplomat Jeff Daigle after being returned by the US branches of auction houses Sotheby's and Christie's, and the Norton Simon Museum in California.
Cambodian officials say the statues were looted in the 1970s by being hacked off their bases in the Koh Ker temple complex in Siem Reap province, also home to the Angkor Wat temples.
The three statues are representations of the mythological Hindu figures Duryodhana, Balarama and Bhima.
Their return marks a step forward in efforts to bring back together nine figures that once formed a tableau in a tower of the temple. The scene captured a famous duel in Hindu mythology in which the warrior Duryodhana is struck down by his cousin Bhima at the end of a bloody war of succession while seven attendants look on.
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Experts say that looters hacked the Koh Ker figures off their bases during the civil war. Some were apparently smuggled out of the country and eventually landed with private collectors or in museums, as did statues from other temples that the Cambodian government hopes to reclaim.
The Cambodian government is asking other museums to return similar objects. Sok An said the handover ceremony was "to welcome these three heroes back where they belong."
The Pasadena, California, museum announced in a statement that it was returning the statue "as a gesture of friendship, and in response to a unique and compelling request by top officials in Cambodia to help rebuild its 'soul' as a nation."
Sotheby's agreed to return the footless figure of Duryodhana, valued at 2 million to 3 million USD, which was placed in Sotheby's catalog in 2011 after the widow of its former Belgian owner gave it up for sale. Sotheby's later pulled it from its catalog.
"While celebrate a happy ending for the statues we see today, we must not forget that the commercial trade in illicitly acquire art still strives. It is incumbent upon each of us to be part of the solution in the combatting this shameful crime," he said.