Daniel Nicholas Mosley, 4th Baron Ravensdale, 8th Baronet, CEng, MIMechE^[1] (born 10 October 1982), is a British hereditary peer and crossbench member of the House of Lords. He is an engineer, currently working as a project director for Atkins.^[2] His paternal great-grandfather was Oswald Mosley, leader and founder of the British Union of Fascists.

On 28 February 2017, he succeeded his grandfather, the novelist Nicholas Mosley (who did not use the titles), in the Mosley baronetcy and as Baron Ravensdale, a peerage created for his great-great-grandfather George Curzon, 1st Marquess Curzon of Kedleston.

Daniel Nicholas Mosley was born on 10 October 1982 in Nottingham to the Hon. Shaun Nicholas Mosley and Teresa Frances Mosley (née Clifford). He attended the University of Sheffield and graduated with a first-class honours degree in aerospace engineering.^[1]

He joined Atkins as a systems engineer in 2006 before becoming a project manager in 2011 and a project director in 2015.^[1]

On 27 March 2019, Ravensdale won a crossbench hereditary peers' by-election, succeeding Viscount Slim in the House of Lords.^[3] In his election statement, he had pledged to "champion the Midlands and commit to regular attendance alongside [his] consultancy work, benefiting the House by maintaining [his] expert knowledge of engineering and industry".^[4]

Mosley married Rachael Carter in 2010. They have three sons.^[1]

He supported the Remain campaign in the 2016 United Kingdom European Union membership referendum, but later opposed a second referendum on the withdrawal agreement.^[5]