Navdeep Singh is a practising lawyer at the Punjab & Haryana High Court, Chandigarh, India. He is the founder President of the Armed Forces Tribunal Bar Association at Chandigarh. Navdeep has been a national service volunteer-reservist with the Territorial Army in the rank of Major in the past. The Territorial Army is a unique force of volunteers who, while carrying on with their civil vocations, wear the uniform for a few days in a year during their spare time in peace so that they can bear arms for the nation's defence during war and national emergencies.

He has been decorated with a record number of 11 Commendations from the Army, Air Force and tri-service institutions for his work for the military community and veterans and other issues confronting the defence services. He has also been operationally deployed, Including voluntarily in counterinsurgency operations during vacation periods of the High Court. Besides constitutional and civil & military employment-related matters, he has enthusiastically worked in the fields of rights of disabled soldiers, military widows & kin and for civil & military pensioners. He strongly advocates judicial independence and the freeing of tribunals and quasi-judicial bodies from the tacit control of the executive. Based on the sentiment expressed by the Prime Minister of India for curbing unnecessary litigation Initiated by the Ministry of Defence against its employees and former employees, he was made a part (gratis) of a High-Level Committee of Experts constituted by the then Defence Minister for reducing such litigation by the Ministry of Defence and the Defence Services in service and pension-related matters, and to strengthen the system of redressal of grievances. He has attended and spoken at multiple international and national level seminars, conferences and meets. He was also a part of the historic Yale Draft (Principles) on Military Justice, an improvement of the existing United Nations document on the same subject, at a meet at the Yale Law School attended by global jurists and representatives of the United Nations.

He regularly contributes opinion pieces and articles on law, military-related issues and public policy to newspapers and other media. He has authored five books. He is a member of the International Society of Military Law and the Law of War.