"On behalf of President (Barack) Obama and the American people, I offer the people of Nepal best wishes for a prosperous and joyful New Year," Kerry said in a statement.
"Nepal has achieved important milestones this past year, including the democratic election of a new Constituent Assembly," he said.
"I hope that the coming year will bring further progress towards enduring political stability and the full completion of a new constitution, keeping your country on the path of prosperity and peace. Naya Barshako Shubha-Kamana!" Kerry said.
"On behalf of President Obama and the American people, I offer warmest greetings to the people of Sri Lanka and the vibrant global Sri Lankan diaspora," Kerry said.
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"This New Year brings a new opportunity for all Sri Lankans to join together in the spirit of tolerance, reconciliation, and peace. As Sri Lankans gather to mark the potential of the New Year, we join in celebrating with you," said the secretary of state.
Greeting Bengalis across the world on the occasion of their new year -- Pahela Boishakh, Kerry conveyed the US' "Warmest greetings to Bengali communities around the world as you celebrate Pahela Boishakh".
"The United States joins you in celebrating the vibrant history and culture of the Bengali-speaking people. Your rich cultural heritage, from food and song to poetry, art, and literature has greatly enriched our own," he said.