Laura Naomi Janner-Klausner (Hebrew: לוֹרָה ג׳אָנֶר-קלְוֹזנֶר; born 1 August 1963) is a British rabbi and an inclusion and development coach who served as the inaugural Senior Rabbi to Reform Judaism from 2011 until 2020. Janner-Klausner grew up in London before studying theology at the University of Cambridge and moving to Israel in 1985, living in Jerusalem for 15 years. She returned to Britain in 1999 and was ordained at Leo Baeck College, serving as rabbi at Alyth Synagogue (North Western Reform Synagogue) until 2011. She has been serving as Rabbi at Bromley Reform Synagogue in south-east London since April 2022.

Janner-Klausner represents a progressive Jewish voice to British Jewry and the wider public, speaking on affairs including Israel-Palestine, social justice, same-sex marriage and interfaith relations. Janner-Klausner is a regular broadcaster on programmes such as BBC Radio 4’s Thought for the Day, BBC Radio 2’s Pause for Thought and BBC One’s The Big Questions and Sunday Morning Live. In November 2014, an article by Jewish journalist Jessica Elgot in The Huffington Post opined that Janner-Klausner was "fast becoming the most high-profile Jewish leader in the country" and described her as "wildly likeable, emphatic, intense, and outspoken". In 2018 she featured in The Progress 1000 list of London's most influential people. She has written a book on the theme of resilience, Bitesize Resilience: A Crisis Survival Guide, which was launched on 7 May 2020. She is co-chair of the Global Interfaith Commission on LGBT+ Lives and an honorary fellow of The Edward Cadbury Centre for the Public Understanding of Religion at the University of Birmingham. She is also a Fellow of the Royal Society of Arts.

Janner-Klausner was raised in north London and attended South Hampstead High School. As a young girl, Janner-Klausner regularly travelled to constituency surgeries at the weekends with her father, Greville Janner, a QC and then a Labour Member of Parliament. Janner-Klausner's great-uncle, Emeritus Chief Rabbi of Great Britain, Sir Israel Brodie, had a profound influence on her growing up. Her siblings are Marion Janner OBE, a mental health campaigner, and Daniel Janner KC, a barrister.

Initially a member of Hampstead Garden Suburb Synagogue, a congregation affiliated to the United Synagogue of Orthodox British Jews, Janner-Klausner has frequently cited her bat mitzvah as a pivotal moment. She was so disaffected by the experience that she left Hampstead Garden Suburb Synagogue the very next day. Janner-Klausner subsequently became involved in youth activities at Alyth Gardens Reform Synagogue near Golders Green, developing a passion for Reform Judaism's values of egalitarianism and social justice and expressing interest in becoming a Rabbi as young as 13.

Janner-Klausner spent her gap year in Israel and was a representative of British Reform Judaism at Machon L'Madrichei Chutz La'Aretz (The Institute for Youth Leaders from Abroad). She returned to London in 1982 and became a founding member of RSY-Netzer, which is now the largest Jewish youth movement in the United Kingdom.

Janner-Klausner studied divinity at Trinity Hall, Cambridge (the alma mater of her father and brother), where she was taught by Rowan Williams, later Archbishop of Canterbury. She studied alongside Linda Woodhead, now Professor in the sociology of religion at Lancaster University. Janner-Klausner was on the Union of Jewish Students executive and ran her university's Israel Society and Progressive Jewish Society. She graduated with a degree in Theological and Religious Studies from the University of Cambridge in 1985.

Following her graduation, aged 22, Janner-Klausner moved to Israel and began teaching Jewish history, Judaism and youth leadership at the Machon L'Madrichei Chutz La'Aretz. She worked there continuously until 1998 and later became the Director of its English-speaking department.

Janner-Klausner began working in 1992 at Melitz, an educational centre specialising in Jewish peoplehood based in Jerusalem, and later served as Director of the Centre for Christian Encounters with Israel, where she helped train Palestinian tour guides in Bethlehem and Jerusalem. She also led Israeli-Palestinian dialogue facilitation for the European Union’s "The People's Peace" programme, following the Oslo I Accord of 1993.