On 7 May 2015, Lewis was elected MP for Norwich South with a 15.8% majority of 7,654.
Lewis, in his victory speech, declared New Labour to be "dead and buried" and promised to stand up for Norwich's most vulnerable against an "onslaught of cuts" by the governing Conservative Party.

In June 2015, Lewis was elected Chair of the All Party Parliamentary Humanist Group.
In the same month, he became a patron of the Anti Academies Alliance.

Lewis was one of 36 Labour MPs to nominate Jeremy Corbyn as a candidate in the 2015 Labour leadership election.
Corbyn credited Lewis with getting his nominations "off the ground".
Lewis has been described as an ally of Corbyn, who was elected leader.
In September 2015, he was appointed to the Labour frontbench as a shadow minister in the Energy and Climate Change team.

Following resignations from Corbyn's shadow cabinet after the 2016 EU referendum, Lewis was appointed as shadow defence secretary.
In September 2016, at the Labour Party's 2016 Conference, when Lewis was preparing to give his first speech as shadow defence secretary, a section of his speech announcing that he "would not seek to change" Labour's current policy on nuclear weapons was changed by Corbyn's communications advisor Seumas Milne.
Lewis was informed of the change by a post-it note.
A month later, Corbyn removed Lewis from the defence brief, replacing him with Nia Griffith.
Lewis was then appointed as shadow business secretary.
The move was viewed as a tactical demotion.

On 8 February 2017, Lewis resigned from the shadow cabinet, citing the Labour Party's decision to whip its MPs to vote to trigger Article 50 to start Brexit negotiations.

In April 2017, Lewis was one of 13 MPs to vote against triggering the 2017 general election.
He was subsequently re-elected with a majority of 30.4 per cent.
On 7 May 2015, Lewis was elected MP for Norwich South with a 15.8% majority of 7,654. Lewis, in his victory speech, declared New Labour to be "dead and buried" and promised to stand up for Norwich's most vulnerable against an "onslaught of cuts" by the governing Conservative Party.
In June 2015, Lewis was elected Chair of the All Party Parliamentary Humanist Group. In the same month, he became a patron of the Anti Academies Alliance.
Lewis was one of 36 Labour MPs to nominate Jeremy Corbyn as a candidate in the 2015 Labour leadership election. Corbyn credited Lewis with getting his nominations "off the ground". Lewis has been described as an ally of Corbyn, who was elected leader. In September 2015, he was appointed to the Labour frontbench as a shadow minister in the Energy and Climate Change team.
Following resignations from Corbyn's shadow cabinet after the 2016 EU referendum, Lewis was appointed as shadow defence secretary. In September 2016, at the Labour Party's 2016 Conference, when Lewis was preparing to give his first speech as shadow defence secretary, a section of his speech announcing that he "would not seek to change" Labour's current policy on nuclear weapons was changed by Corbyn's communications advisor Seumas Milne. Lewis was informed of the change by a post-it note. A month later, Corbyn removed Lewis from the defence brief, replacing him with Nia Griffith. Lewis was then appointed as shadow business secretary. The move was viewed as a tactical demotion.
On 8 February 2017, Lewis resigned from the shadow cabinet, citing the Labour Party's decision to whip its MPs to vote to trigger Article 50 to start Brexit negotiations.
In April 2017, Lewis was one of 13 MPs to vote against triggering the 2017 general election. He was subsequently re-elected with a majority of 30.4 per cent.
Clive Lewis (politician)