Rt Rev Martyn Snow, Bishop of Leicester, has been introduced in the House of Lords.
During a short ceremony led by the Bishop of Durham and St Albans, the 54-year-old swore the Oath of Allegiance to the Crown.
Bishop Martyn said: "It is a great privilege to be entering the House of Lords - one which I will seek to use for the good of others, particularly those who are most in need, both in the UK and beyond our shores.
"Undoubtedly, these are turbulent times in politics and worrying times for millions of families struggling with the cost-of-living. Guided by my faith in Jesus Christ, I hope to be able to use my voice in the Lords to seek peace, justice, and above all, love for our communities.
"I am continually inspired by how churches and other faith groups in Leicester and Leicestershire serve their communities. So, I will seek every opportunity to sing the praises of our area and the people who make it great."
Together with the Archbishops of Canterbury and York, Bishop Martyn joins the 24 other bishops who make up the Lords Spiritual.
The group plays an active role in the upper chamber, reading prayers at the start of each day's parliamentary business and take part in committee work scrutinising draft legislation.
When bishops reach the age of compulsory retirement (70), their membership of the House of Lords also ceases.
Bishop Martyn has been the Bishop of Leicester since February 2016 and is currently the Church of England's lead bishop on Lay Ministry.