After retiring from the IAF, Singh served as a diplomat, politician and advisor to the Government of India. He served as India's Ambassador to Switzerland, the Holy See and Liechtenstein from 1971 to 1974 and as the High Commissioner of India to Kenya from 1974 to 1977. He then served as the Lieutenant Governor of Delhi from 1989 to 1990. In January 2002, the rank of Marshal of the Indian Air Force was conferred on Singh, the first and only officer of the IAF to receive the honour.