For the NPSL of 1967 see North American Soccer League

National Professional Soccer League was a professional indoor soccer league in the USA. It started out as the American Indoor Soccer Association in 1984 but changed its name to the National Professional Soccer League in 1990. During the summer of 2001, the league disbanded and the six surviving teams formed the Major Indoor Soccer League, which would later absorb three teams from the World Indoor Soccer League.

Beginning in 1989, the NPSL would have a unique scoring system where goals were worth 1, 2, or 3 points depending upon distance or game situation.

Teams

• Canton Invaders (1984-1996), Columbus Invaders (1996-1997), Montreal Impact (1997-2000)
• Chicago Vultures (1984-1985), Chicago Shoccers (1985-1987)
• Columbus Capitals (1984-1986)
• Kalamazoo Kangaroos (1984-1986)
• Louisville Thunder (1984-1987)
• Milwaukee Wave (1984-2001)
• Ft. Wayne Flames (1986-1989), Indiana Kick (1989-1990), New York Kick (1990-1991)
• Memphis Storm (1986-1989),Memphis Rouges (1989-1990)
• Tampa Bay Rowdies (1986-1987)
• Toledo Pride (1986-1987)
• Dayton Dynamo (1987-1995),Cincinnati Silverbacks (1995-1998)
• Jacksonville Generals(1987-1988)
• Chicago Power (1988-1996), Edmonton Drillers (1996)
• Hershey Impact (1988-1991),Harrisburg Heat (1991-2001)
• Atlanta Attack (1989-1991), Kansas City Attack (1991-2001)
• Detroit Rockers (1990-2001)
• Illinois Thunder (1990-1992), Denver Thunder (1992-1993)
• Tulsa Ambush (1991-1992), St. Louis Ambush (1992-2000)
• Baltimore Spirit (1992-1998), Baltimore Blast (1998-2001)
• Buffalo Blizzard (1992-2001)
• Cleveland Crunch (1992-2001)
• Wichita Wings (1992-2001)
• Tampa Bay Terror (1995-1997)
• Philadelphia Kixx (1996-2001)
• Toronto Shooting Stars (1996-1997)
• Florida ThunderCats (1998-1999)
• Toronto Thunderhawks (2000-2001)

Championships

SEASON  CHAMPION           RUNNER-UP          SERIES
1984-85 Canton Invaders    Louisville Thunder 3-1 
1985-86 Canton Invaders    Louisville Thunder 3-0 
1986-87 Louisville Thunder Canton Invaders    3-2 
1987-88 Canton Invaders    Ft. Wayne Flames   (Round Robin Challenge Cup Series for Championship) 
1988-89 Canton Invaders    Chicago Power      3-2 
1989-90 Canton invaders    Dayton Dynamo      3-1 
1990-91 Chicago Power      Dayton Dynamo      3-0 
1991-92 Detroit Rockers    Canton Invaders    3-2 
1992-93 Kansas City Attack Cleveland Crunch   3-2 
1993-94 Cleveland Crunch   St. Louis Ambush   3-1
1994-95 St. Louis Ambush   Harrisburg Heat    4-0 
1995-96 Cleveland Crunch   Kansas City Attack 4-2 
1996-97 Kansas City Attack Cleveland Crunch   4-0 
1997-98 Milwaukee Wave     St. Louis Ambush   4-1 
1998-99 Cleveland Crunch   St. Louis Ambush   3-2 
1999-00 Milwaukee Wave     Cleveland Crunch   3-2 
2000-01 Milwaukee Wave     Philadelphia Kixx  3-0