- Mar 1 Andrew Breitbart, American conservative blogger and publisher, dies at 43
- Mar 2 Van Barfoot, American army colonel and Medal of Honour recipient, dies at 92
- Mar 2 Lawrence Anthony, South African conservationist and author, dies from heart attack at 61
- Mar 2 James Wilson, American criminologist, dies at 80
- Mar 2 Norman St John-Stevas, Baron St John of Fawsley, British MP (1964-1987), dies at 82
- Mar 3 Ralph McQuarrie, American conceptual designer, dies at 82
- Mar 5 William Heirens, American serial killer, dies at 83
- Mar 6 Francisco Xavier do Amaral, East Timorese President, dies at 75
- Mar 6 Donald Payne, American Congressman, dies from colon cancer at 77
- Mar 8 Leslie Cochran, American peace activist and police critic, dies from head trauma at 60
- Mar 9 Selma Rubin, American environmental activist, dies at 96
- Mar 9 Lord Wedderton of Charlton, British academic and politician, dies at 84
- Mar 10 Jean Giraud, French comic artist (Alien, Tron), dies at 73
- Mar 10 Mykola Plaviuk, Ukrainian president (1978-81), dies at 86
- Mar 10 Frank Rowland, American Nobel laureate in chemistry, dies from Parkinson's disease at 84
- Mar 11 Sid Couchey, American comic book artist, dies at 92
- Mar 14 Censu Tabone, President of Malta, dies at 98
- Mar 17 John Demjanjuk, convicted Nazi war criminal, dies from natural causes at 91
- Mar 17 Pope Shenouda III, Egyptian Pope of the Coptic Orthodox Church of Alexandria, dies from prostate cancer at 88
- Mar 17 Chaleo Yoovidhya, Thai co-creator of Red Bull energy drink, dies from natural causes at 88
- Mar 18 George Tupou V, King of Tonga, dies at 63
- Mar 19 William Charette, American navy Hospital Corpsman and Medal of Honour recipient, dies at 79
- Mar 20 Jim Stynes, Irish Australian rules footballer, dies from cancer at 45
- Mar 23 Abdullahi Yusuf Ahmed, President of Somalia, dies from liver failure at 77
- Mar 25 Larry Stevenson [Richard], American skateboard innovator, dies from pneumonia and Alzheimer's disease at 81
- Mar 27 Adrienne Rich, American feminist poet/essayist, dies from complications of rheumatoid arthritis at 82
- Mar 27 Hilton Kramer, American art critic, dies from heart failure at 84
- Mar 28 John Arden, English novelist and playwright (Left Handed Liberty), dies at 81
- Mar 28 Hans van den Doel, Dutch politician and economist (PvdA), dies at 74