In July 2012, Sidharth Luthra was appointed as the Additional Solicitor General of India at the Supreme Court and represented the union and various state governments in matters relating to fundamental rights, electoral reforms, criminal law and policy issues.

[7] Luthra is also a member of the Delhi State Legal Services Authority and the Vice-President of the Indian Criminal Justice Society.

[11] Luthra represented the Government of India in the High Court of Delhi from 2004 to 2007 as a Senior Panel Counsel.

He was designated as a Senior Advocate, a position that is conferred on merit to exceptional lawyers by the judges of the high court, in 2007.

[10] Luthra was appointed by the Government of India in 2009 as a counsel to assist the Judges Inquiry Committee in the Justice Soumitra Sen Case.

[14] The then Attorney General of India, late senior advocate Goolam Essaji Vahanvati, the then Solicitor General senior advocate Mohan Parasaran and Luthra swiftly moved a writ petition to the Supreme Court on behalf of the Union Government challenging the power of the Tamil Nadu government to remit the sentences of the convicted Sriharan alias Murugan and six others.

Patnaik, S J Mukhopadhaya, Dipak Misra and F M Ibrahim Kalifulla held that Section 6A of the DSPE Act that granted protection to joint secretary and above officers from facing even a preliminary inquiry by the CBI in corruption cases, was violative of Article 14 of the constitution and thus constitutionally invalid, a decision that was welcomed by the CBI.

[17] Luthra represented WhatsApp in a public interest litigation case filed against it in September 2016 in the Delhi High Court by two students regarding its new privacy policy.

[21] In 2016, Luthra represented the Chief Minister of Andhra Pradesh, Mr. N. Chandrababu Naidu in the 2015 Cash For Vote Scam case.

[22] On 9 December 2016, the Hyderabad High Court set aside the order passed by the Special Anti-Corruption Bureau (ACB) court that directed the Telangana Anti-Corruption Bureau to conduct a probe into Mr Naidu's role in the cash for vote scam case.

[25] The said matter was referred to a constitution bench of the Supreme Court by a bench comprising Justices A K Sikri and R K Agrawal examining an appeal filed by the Uttar Pradesh government challenging Allahabad High Court order for constituting a committee of eminent persons to suggest ways and means to check criminalisation of politics.

Luthra told the bench that the police and the Central Bureau of Investigation should be made immune to political influence so that the criminal trials against politicians can be expedited.

[25] Luthra contributed to the Prevention of Bribery of Foreign Public Officials and Officials of Public International Organisations—A Study and Proposed Amendments[42] report and the Amendments to Criminal Procedure Code, 1973 – Provisions Relating to Bail[43] report released by the Law Commission of India in August 2015 and May 2017 respectively.

Single Mothers, Absent Fathers and the Best Interests of the Child: Drawing a Fine Balance in the ABC Case 9.