Stephen Charles Brine (born 28 January 1974) is a British politician who served as the Member of Parliament (MP) for Winchester from 2010 to 2024.

A member of the Conservative Party, he worked as a BBC radio journalist and in public relations prior to his political career.

Brine had the Conservative whip removed on 3 September by Prime Minister Boris Johnson for supporting the Benn Act, an attempt to prevent a no-deal Brexit.

He was criticised by the Advisory Committee on Business Appointments and Parliamentary Commissioner for Standards for breaching rules on lobbying during the COVID-19 pandemic.

[5] He studied history at Liverpool Hope University, where he also served a sabbatical year as president of its students' union.

[9] Brine worked in the Conservative Central Office as a researcher during William Hague's leadership, and was the campaign director for the party in Hampshire during the 2001−2005 parliament.

[17] His reason for voting against the Act was that he felt that the bill had been rushed and he alleged that it was an issue that had he had received the most opposition to from many of his constituents.

[32] He called for MPs and their staff to be prioritised for the COVID-19 vaccine in January 2021[33] and for all COVID-19 legislative restrictions to be removed by the end of April 2021.

[34] Following the publication of civil servant Sue Gray's report into the Partygate scandal, Brine submitted a letter of no confidence in Prime Minister Boris Johnson calling for his resignation in May 2022.

[38] After being appointed, Brine said his priorities as chair were to get "better value for our money" from the NHS and improving young people's mental health care.

[45][46][47] In March 2023, it was announced that the Parliamentary Commissioner for Standards Daniel Greenberg would be starting an investigation into further lobbying allegations related to his work as a paid advisor for Remedium.

This followed the release of leaked WhatsApp messages by The Daily Telegraph as part of the Lockdown Files in which he stated in early 2021 that he had been "trying for months to help the NHS through a company I am connected with – called Remedium" and that he had attempted to contact the then Secretary of State for Health and Social Care Matt Hancock and Chief Executive of NHS England Simon Stevens but had been rebuffed.

[50] In May 2023, Greenberg found that he had broken rules twice by "failing to declare" that he was a "paid strategic adviser to Remedium Partners" in his discussions with ministers.