Party sources confirmed that the Congress president had resigned from both the positions.
Gandhi was a member of the NMML, according to her Lok Sabha profile. She was also a member of the National Committee formed under the culture ministry to commemorate the 125th birth anniversary of India's first prime minister, Pandit Jawaharlal Nehru.
The celebrations to honour Nehru are expected to start from Nov 14 this year.
Earlier Congress office sources said that Sonia Gandhi had written a letter congratulating BJP's prime minister designate Narendra Modi on his party's recent victory in the Lok Sabha elections.The Congress office said that Gandhi had wriiten the letter today morning.