The 1991 season began on December 29, 1990 and concluded with the championship game on April 6, 1991.

Team Movement

No teams were added, removed, or relocated in the 1991 season. However, the MILL did divide the six teams into two divisions: Detroit, Pittsburgh, and New England comprised the National Division, and the American Division was Baltimore, New York, and Philadelphia.

Regular season

W = Wins, L = Losses, GB = Games Behind Leader, PCT = Winning Percentage, GF = Goals For, GA = Goals Against

Qualified for playoffs

All Star Game

The first-ever MILL All-Star Game

National Lacrosse League All-Star Game

National Lacrosse League All Star Game is a lacrosse game played each year between two teams representing the two divisions of the National Lacrosse League .-1991 :...

 was held at the Spectrum

Wachovia Spectrum

The Spectrum, formerly known as the CoreStates Spectrum , First Union Spectrum , and Wachovia Spectrum was an indoor arena in Philadelphia, Pennsylvania...

 in Philadelphia during the 1991 season. The National Division defeated the American Division 25-20.

Awards

Award	Winner	Team
Rookie of the Year Award	Gary Gait Gary Gait Gary Charles Gait is widely regarded as the best lacrosse player of all time, just above his twin brother Paul. He has starred at the NCAA level at Syracuse University, at the professional level in the National Lacrosse League and Major League Lacrosse, and at the international level for the...	Detroit
Championship Game MVP	Gary Gait	Detroit

All-Pro Teams

First Team:

• John Conley, Philadelphia
• Gary Gait, Detroit
• Paul Gait
  Paul Gait
  Paul Gait is widely regarded as one of the best lacrosse players of all time and is the current Vice President of the Rochester Knighthawks of the National Lacrosse League...
  
  , Detroit
• Rick Sowell, Baltimore
• John Tucker
  John Tucker (lacrosse)
  John Tucker is a retired American professional lacrosse player and the former head coach of the Philadelphia Wings of the National Lacrosse League.-Playing career:...
  
  , Philadelphia
• Ted Sawicki, Detroit (goalie)

Second Team:

• Jeff Jackson, Baltimore
• Butch Marino, Pittsburgh
• Mike Cummings, New York
• John Nostrant, Philadelphia
• Brian Nikula, Pittsburgh
• Sal LoCascio, New York (goalie)

Statistics Leaders

Bold numbers indicate new single-season records. Italics indicate tied single-season records.

Stat	Player	Team	Number
Goals	Paul Gait	Detroit	47
Assists	Gary Gait	Detroit	36
Points	Gary Gait	Detroit	68
Penalty Minutes	Neil Doddridge	Detroit	39