# 1998 NAIA Division II men's basketball tournament

The 1998 NAIA Division II men's basketball tournament was the tournament held by the NAIA to determine the national champion of men's college basketball among its Division II members in the United States and Canada for the 1997–98 basketball season.
Top-seeded defending champions Bethel (IN) defeated Oregon Tech in the championship game, 89–87, to claim the Pilots' third NAIA national title.
The tournament was played at the Idaho Center at Northwest Nazarene University in Nampa, Idaho.

## Qualification

The tournament field remained fixed at thirty-two teams, and the top sixteen teams were seeded.
The tournament continued to utilize a single-elimination format.

## Bracket

| First round | First round | First round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | | Semifinals | Semifinals | Semifinals | | National championship | National championship | National championship |
| 1 | Bethel (IN) | 100 | | | | | | | | | | | | | | |
| | Southwestern (KS) | 84 | | | | | | | | | | | | | | |
| | Southwestern (KS) | 84 | 1 | Bethel (IN) | 107 | | | | | | | | | | | |
| | | | 16 | Briar Cliff | 100 | | | | | | | | | | | |
| | Caldwell | 77 | 16 | Briar Cliff | 100 | | | | | | | | | | | |
| 16 | Briar Cliff | 83 | | | | | | | | | | | | | | |
| 16 | Briar Cliff | 83 | | | | 1 | Bethel (IN) | 88 | | | | | | | | |
| | | | | | | 8 | Whitworth | 85 | | | | | | | | |
| 9 | Cardinal Stritch | 103 | | | | | | | 8 | Whitworth | 85 | | | | | | | | |
| | Central Methodist | 94 | | | | | | | | | | | | | | |
| | Central Methodist | 94 | 9 | Cardinal Stritch | 72 | | | | | | | | | | | |
| | | | 8 | Whitworth | 75 | | | | | | | | | | | |
| | Berea | 78 | 8 | Whitworth | 75 | | | | | | | | | | | |
| 8 | Whitworth | 82 | | | | | | | | | | | | | | |
| 8 | Whitworth | 82 | | | | | | | | 1 | Bethel (IN) | 88 | | | | |
| | | | | | | | | | | 13 | Mount Marty | 86 | | | | |
| 5 | Mount Vernon Nazarene | 86 | | | | | | | | | | | 13 | Mount Marty | 86 | | | | |
| | Saint Ambrose | 83 | | | | | | | | | | | | | | |
| | Saint Ambrose | 83 | 5 | Mount Vernon Nazarene | 80 | | | | | | | | | | | |
| | | | 12 | Western Baptist | 75 | | | | | | | | | | | |
| | Virginia Intermont | 75 | 12 | Western Baptist | 75 | | | | | | | | | | | |
| 12 | Western Baptist | 90 | | | | | | | | | | | | | | |
| 12 | Western Baptist | 90 | | | | 5 | Mount Vernon Nazarene | 69 | | | | | | | | |
| | | | | | | 13 | Mount Marty | 74 | | | | | | | | |
| 13 | Mount Marty | 87 | | | | | | | 13 | Mount Marty | 74 | | | | | | | | |
| | Embry–Riddle (FL) | 75 | | | | | | | | | | | | | | |
| | Embry–Riddle (FL) | 75 | 13 | Mount Marty | 73 | | | | | | | | | | | |
| | | | 4 | Siena Heights | 72 | | | | | | | | | | | |
| | Castleton State | 67 | 4 | Siena Heights | 72 | | | | | | | | | | | |
| 4 | Siena Heights | 89 | | | | | | | | | | | | | | |
| 4 | Siena Heights | 89 | | | | | | | | | | | | 1 | Bethel (IN) | 89 |
| | | | | | | | | | | | | | | 15 | Oregon Tech | 87 |
| 3 | Mayville State | 99 | | | | | | | | | | | | | | | 15 | Oregon Tech | 87 |
| | Bellevue | 72 | | | | | | | | | | | | | | |
| | Bellevue | 72 | 3 | Mayville State | 68 | | | | | | | | | | | |
| | | | | Black Hills State | 59 | | | | | | | | | | | |
| | Black Hills State | 68 | | Black Hills State | 59 | | | | | | | | | | | |
| 14 | Marian | 59 | | | | | | | | | | | | | | |
| 14 | Marian | 59 | | | | 3 | Mayville State | 75 | | | | | | | | |
| | | | | | | 11 | Northwest Nazarene | 84 | | | | | | | | |
| 11 | Northwest Nazarene | 86 | | | | | | | 11 | Northwest Nazarene | 84 | | | | | | | | |
| | Indiana Tech | 73 | | | | | | | | | | | | | | |
| | Indiana Tech | 73 | 11 | Northwest Nazarene | 96 | | | | | | | | | | | |
| | | | 6 | Warner Southern | 84 | | | | | | | | | | | |
| | King (TN) | 65 | 6 | Warner Southern | 84 | | | | | | | | | | | |
| 6 | Warner Southern | 76 | | | | | | | | | | | | | | |
| 6 | Warner Southern | 76 | | | | | | | | 11 | Northwest Nazarene | 75 | | | | |
| | | | | | | | | | | 15 | Oregon Tech | 82 | | | | |
| 7 | Concordia Nebraska | 54 | | | | | | | | | | | 15 | Oregon Tech | 82 | | | | |
| | Holy Names | 65 | | | | | | | | | | | | | | |
| | Holy Names | 65 | | Holy Names | 76 | | | | | | | | | | | |
| | | | 10 | Lewis & Clark | 87 | | | | | | | | | | | |
| | Saint Joseph's (ME) | 82 | 10 | Lewis & Clark | 87 | | | | | | | | | | | |
| 10 | Lewis & Clark | 84 | | | | | | | | | | | | | | |
| 10 | Lewis & Clark | 84 | | | | 10 | Lewis & Clark | 89 | | | | | | | | |
| | | | | | | 15 | Oregon Tech | 100 | | | | | | | | |
| 15 | Oregon Tech | 81 | | | | | | | 15 | Oregon Tech | 100 | | | | | | | | |
| | Walsh | 73 | | | | | | | | | | | | | | |
| | Walsh | 73 | 15 | Oregon Tech | 90 | | | | | | | | | | | |
| | | | 2 | William Jewell | 76 | | | | | | | | | | | |
| | Mary Hardin–Baylor | 68 | 2 | William Jewell | 76 | | | | | | | | | | | |
| 2 | William Jewell | 93 | | | | | | | | | | | | | | |