The following is a list of all team-to-team transactions that have occurred in the National Hockey League during the 1972–73 NHL season. It lists what team each player has been traded to, signed by, or claimed by, and for which player(s) or draft pick(s), if applicable.
| May 24, 1972 | To Detroit Red Wings Gary Doak Rick Newell | To New York Rangers Joe Zanussi 1st-round pick - 1972 Amateur Draft (# 10 - Al Blanchard) | [1] | |
| May 24, 1972 | To St. Louis Blues Steve Durbano | To New York Rangers future considerations (Curt Bennett) (Peter McDuffe)2 | [2] |
| June 6, 1972 | To Buffalo Sabres future considerations1 | To New York Islanders 7th-round pick - 1972 Amateur Draft (# 101 - Don McLaughlin) 8th-round pick - 1972 Amateur Draft (# 117 - Rene Levasseur) 9th-round pick - 1972 Amateur Draft (# 133 - Bill Ennos) 10th-round pick - 1972 Amateur Draft (# 146 - Rene Lambert) | [3] | |
| June 6, 1972 | To New York Rangers future considerations2 | To Atlanta Flames 9th-round pick - 1972 Amateur Draft3 | ||
| June 6, 1972 | To Minnesota North Stars cash | To Atlanta Flames Bob Paradise | [4] | |
| June 6, 1972 | To Minnesota North Stars future considerations (cash) | To New York Islanders Gord Labossiere | [5] | |
| June 6, 1972 | To Los Angeles Kings future considerations2 | To Atlanta Flames 9th-round pick - 1972 Amateur Draft (# 132 - Jean Lamarre) 10th-round pick - 1973 Amateur Draft (# 149 - Guy Ross) | ||
| June 6, 1972 | To Montreal Canadiens 2nd-round pick 9 1973 Amateur Draft (# 17 - Glenn Goldup) cash | To New York Islanders Alex Campbell Denis DeJordy Glenn Resch future considerations4 (Germain Gagnon) | [6] | |
| June 6, 1972 | To New York Rangers future considerations1 | To New York Islanders 7th-round pick - 1973 Amateur Draft (#110 - Denis Anderson) 8th-round pick - 1973 Amateur Draft (# 126 - Denis Desgagnes) | ||
| June 7, 1972 | To Montreal Canadiens 2nd-round pick - 1972 Amateur Draft (# 66 - Bill Nyrop) cash | To Atlanta Flames Ted Tucker 2nd-round pick - 1972 Amateur Draft (# 78 - Jean-Paul Martin) | ||
| June 8, 1972 | To Buffalo Sabres Ron Busniuk | To Montreal Canadiens cash | ||
| June 8, 1972 | To Minnesota North Stars 8th-round pick - 1972 Amateur Draft (# 116 - Scott MacPhail) | To Los Angeles Kings cash | ||
| June 8, 1972 | To St. Louis Blues cash | To New York Rangers 9th-round pick - 1972 Amateur Draft (# 137 - Pierre Archambault) | ||
| June 8, 1972 | To Toronto Maple Leafs 9th-round pick - 1972 Amateur Draft (# 143 - Garry Schofield) | To Boston Bruins cash | ||
| June 8, 1972 | To Minnesota North Stars 10th-round pick - 1972 Amateur Draft (# 145 - Steve Lyon) | To Los Angeles Kings cash | ||
| June 8, 1972 | To California Golden Seals cash | To Minnesota North Stars 10th-round pick - 1972 Amateur Draft (# 147 - Juri Kudrasovs) | ||
| June 8, 1972 | To Minnesota North Stars 10th-round pick - 1972 Amateur Draft (# 148 - Marcel Comeau) | To Philadelphia Flyers cash | ||
| June 8, 1972 | To Toronto Maple Leafs cash | To Minnesota North Stars 10th-round pick - 1972 Amateur Draft5 | ||
| June 9, 1972 | To Montreal Canadiens cash | To Atlanta Flames Lynn Powis | ||
| June 16, 1972 | To Atlanta Flames Bill Hogaboam | To New York Rangers Bill Heindl | [7] | |
| June 16, 1972 | To Montreal Canadiens cash | To Atlanta Flames Rey Comeau |
| August, 1972 (exact date unknown) | To St. Louis Blues cash | To New York Islanders Dave Pulkkinen | [8] | |
| August 3, 1972 | To Boston Bruins cash | To Philadelphia Flyers John McKenzie | [9] | |
| August 10, 1972 | To Montreal Canadiens 3rd-round pick - 1973 Amateur Draft (# 37 - Ed Humphreys) cash | To Atlanta Flames Noel Price | [10] | |
| August 22, 1972 | To Montreal Canadiens 2nd-round pick - 1974 Amateur Draft (# 30 - Gary MacGregor) 3rd-round pick - 1975 Amateur Draft (# 51 - Paul Woods) 1st-round pick - 1976 Amateur Draft (# 13 - Rod Schutt) | To Los Angeles Kings Terry Harper | [11] |
| September 1, 1972 | To St. Louis Blues cash | To New York Islanders Brian Lavender | [12] | |
| September 15, 1972 | To St. Louis Blues Christian Bordeleau | To Chicago Black Hawks rights to John Garrett | [13] |
| October 4, 1972 | To Detroit Red Wings Denis DeJordy Don McLaughlin | To New York Islanders Arnie Brown Gerry Gray | [14] | |
| October 6, 1972 | To Detroit Red Wings Roy Edwards | To Pittsburgh Penguins cash | [15] | |
| October 30, 1972 | To Atlanta Flames Brian McKenzie | To Pittsburgh Penguins cash | [16] |
| November 14, 1972 | To New York Rangers cash | To New York Islanders Ron Stewart | [17] | |
| November 28, 1972 | To Atlanta Flames Leon Rochefort | To Detroit Red Wings Bill Hogaboam | [18] | |
| November 4, 1970 | To Atlanta Flames Curt Bennett | To New York Rangers Ron Harris | [19] |
| December 5, 1972 | To California Golden Seals Darryl Maggs | To Chicago Black Hawks Dick Redmond rights to Bobby Sheehan | [20] | |
| December 14, 1972 | To St. Louis Blues Brent Hughes Pierre Plante | To Philadelphia Flyers Andre Dupont 3rd-round pick - 1973 Amateur Draft (# 40 - Bob Stumpf) | [21] |
| January 17, 1973 | To Detroit Red Wings Brian Lavender Ken Murray | To New York Islanders Bob Cook Ralph Stewart | [22] | |
| January 22, 1973 | To Los Angeles Kings Frank St. Marseille | To St. Louis Blues Paul Curtis | [23] |
| February 13, 1973 | To Atlanta Flames Arnie Brown | To New York Islanders Ernie Hicke future considerations1 (Bill MacMillan) | [24] | |
| February 14, 1973 | To Buffalo Sabres Norm Gratton | To Atlanta Flames Butch Deadmarsh | [25] | |
| February 25, 1973 | To Detroit Red Wings 3rd-round pick - 1973 Amateur Draft (# 39 - Nelson Pyatt) cash | To Pittsburgh Penguins Andy Brown | [26] | |
| February 26, 1973 | To Los Angeles Kings Dan Maloney | To Chicago Black Hawks Ralph Backstrom | [27] |
| March 1, 1973 | To Boston Bruins Gary Doak | To Detroit Red Wings Garnet Bailey future considerations1 (Murray Wing) | ||
| March 1, 1973 | To Minnesota North Stars Don Blackburn | To New York Islanders cash | [28] | |
| March 2, 1973 | To St. Louis Blues Ab DeMarco Jr. | To New York Rangers Mike Murphy | [29] | |
| March 2, 1973 | To Pittsburgh Penguins future considerations2 (Steve Andrascik) | To New York Rangers Sheldon Kannegiesser | [30] | |
| March 3, 1973 | To Toronto Maple Leafs 1st-round pick - 1973 Amateur Draft (# 15 - Ian Turnbull) future considerations3 (Eddie Johnston) | To Boston Bruins Jacques Plante 3rd-round pick - 1973 Amateur Draft (# 36 - Doug Gibson) | [31] | |
| March 4, 1973 | To California Golden Seals cash future considerations4 (Gary Coalter) (Dave Hrechkosy) | To New York Rangers Bert Marshall | [32] | |
| March 5, 1971 | To Philadelphia Flyers Terry Crisp | To New York Islanders Jean Potvin future considerations5 (Glen Irwin) | [33] |
See main article: 1972 NHL Expansion Draft. The 1972–73 NHL season saw the entrance of a 15th and 16th team to the league, the New York Islanders and Atlanta Flames. Each team selected 21 players from across the league, for a total of 42 selections.