Martin Henry Bashir (born 19 January 1963) is a British former journalist. He was a presenter on British and American television and for the BBC's Panorama programme, for which he gained an interview with Diana, Princess of Wales under false pretences in 1995. Although the interview was much heralded at the time, it was later determined that he used forgery and deception to secure it.

Bashir worked for the BBC from 1986 to 1999 on programmes including Panorama before joining ITV. He presented the 2003 ITV documentary about Michael Jackson. From 2004 to 2016, he worked in New York—first as an anchor for ABC's Nightline, then as a political commentator for MSNBC, hosting his own programme, Martin Bashir, and a correspondent for NBC's Dateline NBC. He resigned from MSNBC in December 2013 after making "ill-judged" comments about former Alaska governor and vice presidential candidate Sarah Palin. In 2016, he returned to the BBC as a religious affairs correspondent.

In 2020, the BBC's director general Tim Davie apologised to the princess's brother, Charles Spencer, 9th Earl Spencer, for Bashir's use of faked bank statements to secure his 1995 Panorama interview with her. Former Justice of the Supreme Court Lord Dyson conducted an independent inquiry and concluded that Bashir had commissioned fake statements to deceive Earl Spencer to gain access to Diana, and in so doing had "acted inappropriately and in serious breach of the 1993 edition of the Producers' Guidelines on straight dealing." Bashir resigned from the BBC in May 2021, citing health reasons.

Bashir was born and raised in Wandsworth, London, to liberal Muslim parents from Pakistan; his father served in the Royal Navy during World War II. Bashir was educated at the boys' state comprehensive Wandsworth School, King Alfred's College of Higher Education, Winchester, studying English and History from 1982 to 1985 (at the time, degrees at King Alfred's were approved by the Council for National Academic Awards), and at King's College London, where he completed a master's degree in theology. Bashir embraced Christianity in his late teens.

Bashir was one of five children, one of whom suffered from muscular dystrophy and died in 1991. Bashir attributed his decisions in life to his late brother, including his appearance on The X Factor: Celebrity. Bashir said in 2019, "Every time I have faced a challenge I have heard him whispering saying, 'What excuse do you have? You have no excuse.'"

Bashir was a freelance sports journalist before joining the BBC in 1986. He worked for the BBC until 1999, on programmes including Songs of Praise, Public Eye and Panorama. For Panorama, he interviewed Diana, Princess of Wales in a 1995 edition.

In 1999 he joined ITV, working on special documentary programmes and features for Tonight with Trevor McDonald.

In 2004, Bashir moved to New York, where he worked for ABC, co-anchoring their current affairs show Nightline; along with Cynthia McFadden and Terry Moran, he took over Nightline from Ted Koppel in 2005.