See main article: 2018 Fed Cup Europe/Africa Zone. The play-offs of the 2018 Fed Cup Europe/Africa Zone Group III were the final stages of the Group III zonal competition involving teams from Europe and Africa. Using the positions determined in their pools, the seventeen teams faced off to determine their placing in the 2018 Fed Cup Europe/Africa Zone Group III. The top two teams advanced to Fed Cup Europe/Africa Zone Group II.
| Placing | Pool A (Tunis) | Pool B (Tunis) | Pool A (Ulcinj) | Pool B (Ulcinj) |
|---|---|---|---|---|
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 | colspan=2 | |||
The first placed teams of each pool were drawn in head-to-head rounds. The winners advanced to Group II in 2019.
The second placed teams of each pool were drawn in head-to-head rounds to find the equal third and fourth placed teams.
The third placed teams of each pool were drawn in head-to-head rounds to find the equal fifth and sixth placed teams.
The fourth placed teams of each pool were drawn in head-to-head rounds to find the seventh and equal eighth placed teams.
| Placing | Teams | ||
| Promoted/First | |||
| Second | |||
| Third | |||
| Fourth | |||
| Fifth | |||
| Sixth | |||
| Seventh | |||
| Eighth | |||
| Ninth | |||