- Sep 2 David Capel, English cricket all-rounder (15 Tests; 21 wickets; 23 ODIs), dies from a brain tumour at 57
- Sep 2 William Yorzyk Jr., American swimmer (Olympic gold 200m butterfly, WR 2:19.3, 1956), dies at 87
- Sep 3 Dito, Portuguese soccer defender (17 caps; Braga, Benfica, Vitória Setúbal) and manager (Portimonense, Moreirense), dies from a heart attack at 58
- Sep 4 Peter Cronjé, South African rugby union center (7 caps; Transvaal, Natal), dies from cancer at 70
Lou Brock (1939-2020)
Sep 6 American Baseball Hall of Fame outfielder (6 × MLB All-Star; World Series 1964, 67; 8 × NL stolen base leader; St Louis Cardinals), dies from multiple myeloma at 81
- Sep 6 Tom Jernstedt, American Basketball Hall of Fame administrator (NCAA 1972-2010), dies at 75
- Sep 8 Alfred Riedl, Austrian soccer striker (4 caps; Austria Wien, Standard Liège) and manager (Austria, Liechtenstein, Vietnam, Palestine, Laos, Indonesia), dies at 70
- Sep 8 Gene A. Budig, American baseball executive (last American League [AL] president 1994-99), dies from liver disease at 81
- Sep 9 Alan Minter, English boxer (world middleweight champion 1980), dies from cancer at 69
- Sep 11 Nadhim Shaker, Iraqi soccer defender (57 caps; Al-Tayaran) and coach (Iraq), dies from COVID-19 at 61
- Sep 11 Sonny Allen, American basketball coach (ODU, Southern Methodist University, University of Nevada, Reno; WNBA Sacramento Monarchs), dies of Parkinson's Disease at 84
- Sep 14 André Guesdon, French soccer defender (Monaco, Nice) and manager (Viry-Châtillon, Angers, Brest), dies at 71
- Sep 15 Sadashiv Patil, Indian cricket fast bowler (1 Test, 2 wickets; Maharashtra), dies at 86
- Sep 15 Wang Zhiliang, Chinese table tennis player and coach (World Table Tennis C'ships gold, doubles 1963), dies from a stroke at 79
- Sep 16 Jack Kelley, American collegiate, WHA, and NHL ice hockey coach, and executive (Colby College coach, 1955-62; Boston University coach, 1962-72; New England Whalers, coach and general manager, 1972-81; Pittsburgh Penquins president, 1993-2001), dies at 93
- Sep 17 Larry Wilson, American Pro Football Hall of Fame free safety (8 x Pro Bowl; 6 x All Pro 1st Team; NFL Defensive Player of Year 1966; St. Louis Cardinals), dies at 82
- Sep 20 Garland F. Pinholster, American college basketball coach (USA: gold Pan American Games 1963; Oglethorpe University 1956-66), dies at 92
- Sep 21 Bob Nevin, Canadian ice hockey right wing (Stanley Cup 1962, 63; Toronto Maple Leafs; NY Rangers; 1,128 career NHL games), dies at 82
- Sep 21 Jaime Alves, Portuguese soccer midfielder (3 caps; Boavista), dies at 55
- Sep 21 Lars-Åke Lagrell, Swedish sports administrator (President Swedish Football Association 1991-2012) and politician (Governor Kronoberg County 2002-06), dies at 80
- Sep 22 Agne Simonsson, Swedish soccer striker (51 caps; Örgryte IS, Real Madrid, Real Sociedad) and manager (Örgryte IS, BK Häcken), dies from pneumonia at 84
- Sep 23 Bobby Wilson, English tennis player (Wimbledon doubles 1960 runner-up), dies at 84
Gale Sayers (1943-2020)
Sep 23 American College and Pro Football Hall of Fame halfback, 4X Pro Bowl, 2X NFL rushing leader (Chicago Bears), and source for the TV movie "Brian's Song", dies from dementia and Alzheimer’s disease at 77 [1]
- Sep 23 Ray Batten, English rugby league back-rower (Great Britain 3, England 3 Tests; Leeds 434 games) and coach (Wakefield Trinity), dies at 75
- Sep 24 Dean Jones, Australian cricket batsman and broadcaster (52 Tests @ 46.55; 164 ODIs; Victoria), dies from cardiac arrest at 59
- Sep 24 Keith Hufnagel, American skateboarder (founded skate/clothing company HUF), dies of brain cancer at 46
- Sep 28 Hiroki Yuhara, Japanese rugby union hooker (22 caps; Toshiba Brave Lupus), dies at 36
- Sep 29 Doyle Royal, American collegiate soccer coach (NCAA C'ship 1968; University of Maryland 1946-73) and tennis coach (U of Maryland 1954-80), dies at 101
- Sep 29 John Whittaker, New Zealand rugby league utility back (26 Tests; Wellington; Warrington), dies from cancer at 70
Baseball Players
Basketball Stars
Boxers
Footballers
NFL Stars
Tennis Champions