The 1989 Division III NCAA Tournament was expanded from 32 teams to 40.

Championship
UW-Whitewater 94, Trenton State 86
at Springfield, Ohio (att. 2,882)

All-Tournament Team
Greg Grant, Trenton State (Most Outstanding Player)
Ricky Spicer, UW-Whitewater
Elbert Gordon, UW-Whitewater
Jeff Seifriz, UW-Whitewater
Danny Johnson, Centre
Jeff Bowers, Southern Maine 

Third Place
Southern Maine 81, Centre 70

National Semifinals
Trenton State 84, Southern Maine 62
UW-Whitewater 88, Centre 81

Quarterfinals
Southern Maine 79, Franklin & Marshall 71
Trenton State 78, Potsdam State 62
UW-Whitewater 105, Otterbein 86
Centre 124, Cal State Stanislaus 123 (2 OT)

Regional Championships
Southern Maine 90, Western Connecticut State 88
Franklin & Marshall 96, Washington College 76
Potsdam State 74, Buffalo State 60
Trenton State 78, Jersey City State 77
UW-Whitewater 95, North Central 83
Otterbein 76, Wittenberg 66
Cal State Stanislaus 76, Nebraska Wesleyan 66
Centre 69, Washington U. 68

Regional Third Place
North Adams State 112, Salem State 78; Grove City 74, Susquehanna 60; Kings Point 69, Staten Island 54; Hampden-Sydney 80, Shenandoah 78; Monmouth 87, Millikin 84; Calvin 89, Allegheny 87 (OT); Pomona-Pitzer 80, Wartburg 67

Regional Semifinals
Southern Maine 88, North Adams State 80
Western Connecticut 89, Salem State 84
Franklin & Marshall 59, Susquehanna 54
Washington College 82, Grove City 69
Buffalo State 76, Staten Island 51
Potsdam State 80, Kings Point 68
Trenton State 96, Shenandoah 74
Jersey City State 94, Hampden-Sydney 84
UW-Whitewater 112, Monmouth 76
North Central 63, Millikin 59
Wittenberg 61, Allegheny 46
Otterbein 93, Calvin 90
Nebraska Wesleyan 87, Wartburg 63
Cal State Stanislaus 90, Pomona-Pitzer 78
Centre 88, Rose-Hulman 75
Washington (Mo.) 2, Rust 0 *
Rust showed at the tournament site in Terre Haute, Ind., but was found to have ineligible players and was forced to forfeit. 

First Round
Staten Island 96, Alfred 72
Shenandoah 74, Stockton State 64
Monmouth (Ill.) 82, Beloit 70
Allegheny 71, Hope 69
Calvin 69, Capital 64
Wartburg 78, Gustavus Adolphus 62
Pomona-Pitzer 108, Cal State Bernardino 104 (2 OT)
Rose-Hulman 56, Christopher Newport 42

Stockton State is now known as Richard Stockton. North Adams State is now known as Massachusetts College. Trenton State is now known as The College of New Jersey. Jersey City State is now known as New Jersey City.