| Sep 13, 1979 Thu | Preseason | Hartford | NY Islanders | Luksa-Devine Kotsopoulos-Carroll |
| Sep 15, 1979 Sat | Preseason | Boston | NY Islanders | Breault-Skjodt O'Neill-McKendry Blood-Davis |
| Sep 22, 1979 Sat | Preseason | Philadelphia | NY Islanders | Busniuk-Vautour Gorence-Sutter Busniuk-Andres |
| Sep 23, 1979 Sun | Preseason | NY Islanders | Hartford | Add Fight |
| Sep 25, 1979 Tue | Preseason | Buffalo | NY Islanders | Add Fight |
| Sep 27, 1979 Thu | Preseason | Atlanta | NY Islanders | Add Fight |
| Sep 28, 1979 Fri | Preseason | NY Islanders | Atlanta | Add Fight |
| Sep 29, 1979 Sat | Preseason | NY Rangers | NY Islanders | Maloney-Vautour Marois-Lorimer Maloney-Langevin (2) |
| Sep 30, 1979 Sun | Preseason | NY Islanders | Buffalo | Add Fight |
| Oct 2, 1979 Tue | Preseason | NY Islanders | NY Rangers | Vautour-Greschner (3) Sutter-Hickey (5.7) Howatt-Maloney |
| Oct 3, 1979 Wed | Preseason | NY Islanders | Quebec | Add Fight |
| Oct 11, 1979 Thu | | NY Islanders | Philadelphia | Nystrom-Bathe (4) |
| Oct 13, 1979 Sat | | Buffalo | NY Islanders | Add Fight |
| Oct 16, 1979 Tue | | Atlanta | NY Islanders | Houston-Vautour (3.5) Marsh-Harris (2) Plett-Kaszycki Rota-Langevin (6) |
| Oct 18, 1979 Thu | | NY Islanders | Boston | Add Fight |
| Oct 20, 1979 Sat | | Hartford | NY Islanders | Add Fight |
| Oct 23, 1979 Tue | | Edmonton | NY Islanders | (Rough) Campbell-Vautour Semenko-Smith (3.5) Semenko-Howatt Hunter-Vautour Campbell-Hordy |
| Oct 26, 1979 Fri | | NY Islanders | Hartford | Add Fight |
| Oct 27, 1979 Sat | | Chicago | NY Islanders | Add Fight |
| Oct 31, 1979 Wed | | NY Islanders | Vancouver | Add Fight |
| Nov 2, 1979 Fri | | NY Islanders | Edmonton | Howatt-Campbell |
| Nov 4, 1979 Sun | | NY Islanders | Winnipeg | Add Fight |
| Nov 6, 1979 Tue | | Los Angeles | NY Islanders | Add Fight |
| Nov 9, 1979 Fri | | NY Islanders | Atlanta | Lorimer-Rota |
| Nov 10, 1979 Sat | | Philadelphia | NY Islanders | (Rough) Linseman-Potvin Bridgman-Langevin (3.8) Barnes-Howatt Holmgren-Lewis (3.6) Dupont-Howatt (3.5) |
| Nov 13, 1979 Tue | | NY Rangers | NY Islanders | Add Fight |
| Nov 17, 1979 Sat | | Detroit | NY Islanders | Miller-Bourne |
| Nov 20, 1979 Tue | | NY Islanders | St. Louis | Gillies-Komadoski Howatt-Sutter Tonelli-Chapman |
| Nov 21, 1979 Wed | | NY Islanders | Minnesota | Add Fight |
| Nov 24, 1979 Sat | | NY Islanders | Los Angeles | (Cheap) Unknown-Wilson |
| Nov 28, 1979 Wed | | NY Islanders | Colorado | Bourne-Turner (5.7) Howatt-McEwen (4) |
| Nov 30, 1979 Fri | | NY Islanders | Edmonton | Vautour-Driscoll (Rough) Nystrom-Hunter Langevin-Lumley |
| Dec 2, 1979 Sun | | NY Islanders | Winnipeg | Add Fight |
| Dec 4, 1979 Tue | | Vancouver | NY Islanders | Smith-Bourne Fraser-Langevin (6.3) Lindgren-Gillies (3) Sedlbauer-Langevin |
| Dec 6, 1979 Thu | | Boston | NY Islanders | Jonathan-Howatt (4) |
| Dec 8, 1979 Sat | | NY Islanders | Toronto | Nystrom-Butler (3.8) Howatt-Williams (3.7) |
| Dec 9, 1979 Sun | | NY Islanders | NY Rangers | Gillies-Duguay (2) Lewis-Marois (3) Howatt-Maloney |
| Dec 11, 1979 Tue | | Montreal | NY Islanders | Add Fight |
| Dec 12, 1979 Wed | | NY Islanders | Pittsburgh | Add Fight |
| Dec 15, 1979 Sat | | Pittsburgh | NY Islanders | Add Fight |
| Dec 18, 1979 Tue | | Colorado | NY Islanders | Delorme-Lane (2) Ramage-Lorimer (4) |
| Dec 22, 1979 Sat | | Washington | NY Islanders | Add Fight |
| Dec 23, 1979 Sun | | NY Islanders | Chicago | Bourne-Fox (4.5) Howatt-Kerr (7.8) Smith-Mulvey (5.2) Lane-Daigle (4) Langevin-Mulvey (1) |
| Dec 27, 1979 Thu | | NY Islanders | Montreal | Add Fight |
| Dec 30, 1979 Sun | | NY Islanders | Detroit | Langevin-Larson Nystrom-Larson Lane-Bolduc Howatt-Korn |
| Jan 2, 1980 Wed | | NY Islanders | Toronto | Add Fight |
| Jan 3, 1980 Thu | | Pittsburgh | NY Islanders | Clackson-Lane Clackson-Howatt (2.5) |
| Jan 5, 1980 Sat | | St. Louis | NY Islanders | Add Fight |
| Jan 8, 1980 Tue | | Vancouver | NY Islanders | Hughes-Howatt (6) Smith-Lewis |
| Jan 9, 1980 Wed | | NY Islanders | Buffalo | Add Fight |
| Jan 12, 1980 Sat | | Washington | NY Islanders | Green-Sutter (5) Walter-Lane |
| Jan 15, 1980 Tue | | Winnipeg | NY Islanders | Add Fight |
| Jan 17, 1980 Thu | | Toronto | NY Islanders | Add Fight |
| Jan 19, 1980 Sat | | Quebec | NY Islanders | Add Fight |
| Jan 22, 1980 Tue | | Montreal | NY Islanders | Gingras-Howatt |
| Jan 23, 1980 Wed | | NY Islanders | Detroit | Nystrom-Korn (1.5) Langevin-Polonich |
| Jan 26, 1980 Sat | | Hartford | NY Islanders | Add Fight |
| Jan 27, 1980 Sun | | NY Islanders | Washington | Add Fight |
| Jan 29, 1980 Tue | | Minnesota | NY Islanders | Add Fight |
| Jan 31, 1980 Thu | | NY Islanders | Boston | Lorimer-Wensink (4) Scrum at 37:32 |
| Feb 2, 1980 Sat | | Buffalo | NY Islanders | Add Fight |
| Feb 3, 1980 Sun | | NY Islanders | Hartford | Add Fight |
| Feb 7, 1980 Thu | | Los Angeles | NY Islanders | Kelly-Howatt |
| Feb 9, 1980 Sat | | Quebec | NY Islanders | Weir-Lane Stewart-Lane (3.5) Stewart-Howatt (4.7) |
| Feb 12, 1980 Tue | | Winnipeg | NY Islanders | Mann-Sutter (3) |
| Feb 14, 1980 Thu | | NY Islanders | Colorado | Sutter-Gillis Lane-Delorme Bourne-Ramage Howatt-Robert |
| Feb 16, 1980 Sat | | NY Islanders | Los Angeles | Nystrom-Wells Nystrom-Wells Smith-Simmer |
| Feb 17, 1980 Sun | | NY Islanders | Vancouver | Howatt-Hughes (3) |
| Feb 19, 1980 Tue | | Toronto | NY Islanders | Mulhern-Nystrom Paiement-Howatt |
| Feb 21, 1980 Thu | | Minnesota | NY Islanders | (Rough) Smith-Howatt Scrum at 12:00 Giles-Sutter |
| Feb 23, 1980 Sat | | NY Islanders | St. Louis | Howatt-Maxwell Langevin-Sutter |
| Feb 24, 1980 Sun | | NY Islanders | NY Rangers | Howatt-Vadnais (5) Langevin-Duguay (Cheap) Smith-Maloney (Rough) Persson-Maloney Scrum at 59:07 (Rough) Howatt-Johnstone Howatt-Beck (2.7) |
| Feb 27, 1980 Wed | | NY Islanders | Quebec | Nystrom-Baxter (5.5) |
| Mar 1, 1980 Sat | | Detroit | NY Islanders | Add Fight |
| Mar 2, 1980 Sun | | NY Islanders | Pittsburgh | Add Fight |
| Mar 4, 1980 Tue | | Edmonton | NY Islanders | Campbell-Bourne (7) Messier-Langevin (8) |
| Mar 6, 1980 Thu | | NY Islanders | Philadelphia | Add Fight |
| Mar 8, 1980 Sat | | Boston | NY Islanders | Add Fight |
| Mar 9, 1980 Sun | | NY Islanders | Washington | Nystrom-Walter (7.3) |
| Mar 11, 1980 Tue | | Colorado | NY Islanders | Delorme-Howatt (4) |
| Mar 15, 1980 Sat | | St. Louis | NY Islanders | Add Fight |
| Mar 16, 1980 Sun | | NY Islanders | Chicago | Howatt-Ruskowski (7) |
| Mar 18, 1980 Tue | | Atlanta | NY Islanders | Shand-Sutter Shand-Howatt (4) |
| Mar 22, 1980 Sat | | Chicago | NY Islanders | Add Fight |
| Mar 23, 1980 Sun | | NY Islanders | Buffalo | Add Fight |
| Mar 25, 1980 Tue | | Philadelphia | NY Islanders | Busniuk-Sutter (Rough) Watson-Gillies |
| Mar 28, 1980 Fri | | NY Islanders | Montreal | Add Fight |
| Mar 30, 1980 Sun | | NY Islanders | Quebec | Add Fight |
| Apr 1, 1980 Tue | | NY Islanders | Minnesota | Gillies-Barrett Scrum at 34:48 Line Brawl at 34:48 Sutter-Christoff Lane-Smith |
| Apr 4, 1980 Fri | | NY Islanders | Atlanta | Add Fight |
| Apr 5, 1980 Sat | | NY Rangers | NY Islanders | Vickers-Sutter (3) |
| Apr 8, 1980 Tue | Round 1 | Game 1 | Los Angeles | NY Islanders | Hardy-Sutter |
| Apr 9, 1980 Wed | Round 1 | Game 2 | Los Angeles | NY Islanders | Wells-Howatt (6.7) |
| Apr 11, 1980 Fri | Round 1 | Game 3 | NY Islanders | Los Angeles | Lane-Taylor Gillies-Korab |
| Apr 12, 1980 Sat | Round 1 | Game 4 | NY Islanders | Los Angeles | Howatt-Hopkins Langevin-Carlson |
| Apr 16, 1980 Wed | QF | Game 1 | NY Islanders | Boston | Add Fight |
| Apr 17, 1980 Thu | QF | Game 2 | NY Islanders | Boston | Gillies-O'Reilly (6.6) Howatt-Cashman (5.4) Nystrom-Wensink (8.1) Gillies-O'Reilly (3.3) Sutter-Milbury (3.3) Lorimer-Jonathan (3.5) Bench-Clearing Brawl at 20:00 (10) (Rough) Langevin-McCrimmon (1) Lane-Secord (3.8) Lorimer-Jonathan (7.4) Howatt-Cashman (9.1) |
| Apr 19, 1980 Sat | QF | Game 3 | Boston | NY Islanders | Milbury-Sutter O'Reilly-Gillies (7.2) O'Reilly-Gillies (7) O'Reilly-Howatt (3.5) |
| Apr 21, 1980 Mon | QF | Game 4 | Boston | NY Islanders | McCrimmon-Nystrom (4.2) |
| Apr 22, 1980 Tue | QF | Game 5 | NY Islanders | Boston | Sutter-Milbury Gillies-Secord (4.4) Howatt-Bourque (5) |
| Apr 29, 1980 Tue | SF | Game 1 | NY Islanders | Buffalo | (Cheap) Lane-Seiling |
| May 1, 1980 Thu | SF | Game 2 | NY Islanders | Buffalo | Add Fight |
| May 3, 1980 Sat | SF | Game 3 | Buffalo | NY Islanders | Add Fight |
| May 6, 1980 Tue | SF | Game 4 | Buffalo | NY Islanders | Scrum at 18:46 (3) Scrum at 38:14 (2) |
| May 8, 1980 Thu | SF | Game 5 | NY Islanders | Buffalo | Lane-Ruff (6) Langevin-Dudley (5) Scrum at 31:16 |
| May 10, 1980 Sat | SF | Game 6 | Buffalo | NY Islanders | Scrum at 16:39 (4) Scrum at 35:26 (1) (Cheap) Ruff-Smith (7) (Rough) Ruff-Smith (4.5) |
| May 13, 1980 Tue | Final | Game 1 | NY Islanders | Philadelphia | Sutter-Watson (3) |
| May 15, 1980 Thu | Final | Game 2 | NY Islanders | Philadelphia | (Rough) Lane-Barber (Almost) Sutter-Wilson Sutter-Bridgman (1) Howatt-Wilson (2) |
| May 17, 1980 Sat | Final | Game 3 | Philadelphia | NY Islanders | Busniuk-Nystrom (3.3) McIlhargey-Lane (6) (Rough) Linseman-Nystrom Scrum at 59:31 |
| May 19, 1980 Mon | Final | Game 4 | Philadelphia | NY Islanders | Bridgman-Langevin (3) |
| May 22, 1980 Thu | Final | Game 5 | NY Islanders | Philadelphia | Howatt-Bridgman (2.5) (Cheap) Smith-Bridgman (4) |
| May 24, 1980 Sat | Final | Game 6 | Philadelphia | NY Islanders | (Almost) Holmgren-Lane (Rough) Kelly-Morrow (3) Kelly-Nystrom (5.8) (Rough) Bridgman-Nystrom Scrum at 23:15 (Rough) Bridgman-Bossy (Cheap) Peeters-Nystrom Holmgren-Gillies (4.2) (Rough) Linseman-unknown Event at 67:11 |