In Calcutta, the city where Mother Teresa lived and carried out most of her work, there have been prayers and a vigil to mark the beatification.
Nuns celebrate the beatification at Mother House
Most people were able to watch the coverage at the Vatican live from their homes.
A small group of children gathered outside Mother House, the headquarters of the Order of Missionaries set up by Mother Teresa.
They held pictures of white doves and placards. One read: "Let every action of mine be something beautiful for God."
'Already a saint'
It was a reflection of the philosophy behind Mother Teresa's work here in India.
Inside the house, worshippers came to join in prayer.
Her tomb lies inside and a candlelit vigil is being held throughout the day.
Members of other faiths joined in too. One Sikh who had come from Amritsar spoke of how India had already accepted her as a saint.
The beatification in Rome was watched keenly throughout west Bengal.
All across India people marked the occasion
But there were no huge celebrations at Mother House, the sisters there insisting that their work should continue because that is what Mother Teresa would have wanted.
Sister Nicole, of the Missionaries of Charity, says the beatification is a validation of the tireless work of a woman who came to be known as the angel of mercy.
But her road to sainthood has also caused controversy.
The Rationalist Society of India, a campaign group promoting science over superstition, has questioned the basis of the miracle that has put Mother Teresa on the fast track to sainthood.
They claim it is leading the sick to look to superstition for comfort.
But Calcutta is a city that feels blessed now Pope John Paul's declaration that Mother Teresa has become Blessed Teresa of Calcutta.