| Competition: | Segunda División |
| Season: | 1948–49 |
| Winners: | Real Sociedad |
| Promoted: | Real Sociedad Málaga |
| League Topscorer: | Pedro Bazán (26 goals) |
| Best Goalkeeper: | Candi (1.16 goals/match) |
| Biggest Home Win: | (12 September 1948) |
| Biggest Away Win: | (17 April 1949) |
| Highest Scoring: | (12 December 1948) |
| Matches: | 182 |
| Total Goals: | 734 |
| Prevseason: | 1947–48 |
| Nextseason: | 1949–50 |
The 1948–49 Segunda División season was the 18th since its establishment and was played between 11 September 1948 and 17 April 1949.
14 teams joined the league, including two relegated from the 1947–48 La Liga and two promoted from the 1947–48 Tercera División.
| Goalscorers | Goals | Team |
|---|---|---|
 Pedro Bazán | 26 | Málaga |
| 24 | Granada | |
| Calsita | 24 | Hércules |
| José Caeiro | 23 | Real Sociedad |
| Francisco Mamblona | 23 | Castellón |
| Goalkeeper | Goals | Matches | Average | Team | |
|---|---|---|---|---|---|
| Candi | 22 | 19 | Granada | ||
| Cayetano Gana | 34 | 25 | Baracaldo | ||
| José María Munárriz | 21 | 15 | Real Gijón | ||
| Cesáreo López | 30 | 20 | Málaga | ||
| Juan Bagur | 41 | 26 | Real Sociedad |