The High Court of Delhi was established on 31st October, 1966.
On 21 March 1919, the High Court of Judicature at Lahore was established with jurisdiction over the provinces of Punjab and Delhi. This jurisdiction lasted till 1947 when India was partitioned.
The High Courts (Punjab) Order, 1947 established a new High Court for the province of East Punjab with effect from 15 August 1947. The India (Adaptation of Existing Indian Laws) Order, 1947 provided that any reference in an existing Indian law to the High Court of Judicature at Lahore be replaced by a reference to the High Court of East Punjab.
The High Court of East Punjab started functioning from Shimla in a building called "Peterhoff". This building burnt down in January, 1981.
When the Secretariat of the Punjab Government shifted to Chandigarh in 1954-55, The High Court also shifted to Chandigarh. The High Court of Punjab, as it later came to be called, exercised jurisdiction over Delhi through a Circuit Bench which dealt with the cases pertaining to the Union Territory of Delhi and the Delhi Administration.
In view of the importance of Delhi, its population and other considerations, the Indian Parliament, by enacting the Delhi High Court Act, 1966, established the High Court of Delhi effective from 31 October 1966.
By virtue of Section 3(1) of the Delhi High Court Act, the Central Government was empowered to appoint a date by a notification in the official gazette, establishing a High Court for the Union Territory of Delhi. The appointed date was 31 October 1966.
The High Court of Delhi initially exercised jurisdiction not only over the Union Territory of Delhi, but also Himachal Pradesh. The High Court of Delhi had a Himachal Pradesh Bench at Shimla in a building called Ravenswood. The High Court of Delhi continued to exercise jurisdiction over Himachal Pradesh until the State of Himachal Pradesh Act, 1970 came into force on 25 January 1971.