The 1998 Spanish Soccer Tercera División play-offs to Segunda División B from Tercera División (Promotion play-offs) were the final playoffs for the promotion from 1997–98 Tercera División to 1998–99 Segunda División B. The first four teams in each group[1] (excluding reserve teams) took part in the play-off. 
   The 68 participating soccer teams were divided into 5 series each made up of 4 groups in the category, with the exception of  Series E , which was only formed by  Group XII . Each series was divided into 4 groups formed by a 1st, a 2nd, a 3rd and a 4th classified from each group, which played a double-round playoff. Each victory was equivalent to 3 points, the tie to 1 point and the defeat to 0 points. The champion of each group obtained the promotion to Second Division B. 
The distribution of each series was as follows: 
  Teams for 1997–98 play-offs
  
 
     Tables and Results
 Group A-1
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group A-2
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group A-3
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group A-4
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group B-1
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group B-2
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group B-3
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group B-4
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group C-1
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group C-2
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group C-3
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group C-4
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group D-1
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group D-2
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group D-3
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group D-4
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
 Group E
     Updated to match(es) played on completed. Source: 
FutbolMeLegend: Blue = home team win; Yellow = draw; Red = away team win.
   | Group I – Galicia    Group II – Asturias    Group III – Cantabria    Group IV – Basque Country    Group V – Catalonia    Group VI – Valencian Community .svg.png)  | Group VII – Community of Madrid    Group VIII – Castile and León    Group IX – E. Andalusia and Melilla     Group X – W. Andalusia and Ceuta     Group XI – Balearic Islands    Group XII – Canary Islands    | Group XIII – Region of Murcia    Group XIV – Extremadura  .svg.png)  Group XV – Navarre and La Rioja   .svg.png)  Group XVI – Aragon    Group XVII – Castilla–La Mancha    | 
 References
  External links
   |  | 
|---|
|  | 
| Domestic leagues |  | 
|---|
| Domestic cups |  | 
|---|
| European competitions |  | 
|---|
| Related to national team |  | 
|---|
| | Club seasons |  | La Liga |  | 
|---|
 | Segunda División |  AlavésAlbaceteAtlético Madrid BBadajozEibarElcheExtremaduraHérculesJaénLas PalmasLeganésLevanteLleidaLogroñésNumanciaOsasunaOurenseRayo VallecanoSevillaToledoVillarealXerez
 | 
|---|
 |