| Prevseason: | 2004–05 |
| Nextseason: | 2006–07 |
| FIBA EuroCup | |
| T Bg: |
|
| T Color: | white |
| Season: | 2005–06 |
| Champions: |  Joventut Badalona (1st title) |
| Runners Up: |  Khimki |
| Third Place: |  Kyiv |
| Fourth Place: | Dynamo Saint Petersburg |
| Teams: | 32 |
| Ppg: | 19.8 |
| Rpg: | 11.5 |
| Apg: | 5.8 |
The 2005–06 FIBA EuroCup was the 3rd season of the FIBA EuroCup, the third-strongest pan-European club basketball competition. It was the first season of the competition under the new name EuroCup which is now used for the formerly known ULEB Cup. A total number of 32 teams from 20 countries participated in competition. The season finished with the EuroCup Final Four, which was held in Kyiv, Ukraine. Joventut Badalona won the cup after defeating BC Khimki 88–63 in the final.
A number of 32 teams were split into 8 groups of four teams each. The top two teams in each group advanced to the next stage, where they were split into new four groups of four. The top two teams in each group in the second group stage advanced to the Quarter-Final, which was played in a Best-of-three playoff system. The winner of each series advanced to the 2006 EuroCup Final Four, which was held in Kyiv.
The number of the teams remained at 32 of which 7 were domestic champions (including Croatia) and 4 runners-up, including France and Israel.
| Country | Teams | Teams | ||||
|---|---|---|---|---|---|---|
| Russia | 4 | BC Khimki (4th) | Dynamo St. Petersburg (5th) | Lokomotiv Rostov (6th) | Dynamo Moscow Region (7th) | |
 France | 3 | SLUC Nancy (2nd) | Cholet (9th) | BCM Gravelines (10th) | ||
 Israel | 3 | Hapoel Tel Aviv (2nd) | Hapoel Galil Elyon (3rd) | Ironi Strauss Iscar Nahariya (6th) | ||
 Belgium | 2 | Dexia Union Mons-Hainaut (3rd) | Leuven (6th) | |||
| Spain | 2 | DKV Joventut Badalona (7th) | CB Gran Canaria (8th) | |||
| Germany | 2 | RheinEnergie Köln (5th) | Telekom Baskets Bonn (9th) | |||
| Greece | 2 | Maroussi Honda (4th) | PAOK Thessaloniki (5th) | |||
| Ukraine | 2 | Kyiv (1st) | Azovmash Mariupol (2nd) | |||
 Austria | 1 | Allianz Swans Gmunden (1st) | ||||
| Croatia | 1 | KK Zadar (1st) | ||||
 Cyprus | 1 | Proteas EKA AEL Limassol (1st) | ||||
 Czech Republic | 1 | ČEZ Nymburk (1st) | ||||
 Estonia | 1 | BC Kalev/Cramo(1st) | ||||
 Italy | 1 | Vertical Vision Cantu (6th) | ||||
| Latvia | 1 | Barons Riga (2nd) | ||||
 Lithuania | 1 | BC Šiauliai (3rd) | ||||
| Netherlands | 1 | MPC Capitals (5th) | ||||
 Poland | 1 | WKS Slask Wroclaw (5th) | ||||
| Romania | 1 | CSU Asesoft Ploiesti (1st) | ||||
 Turkey | 1 | Fenerbahçe (4th) | ||||
| width=15 | width=220 | Team | width=20 | Pld | width=20 | W | width=20 | L | width=20 | PF | width=20 | PA | width=30 | Diff | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | BC Kyiv | 6 | 4 | 2 | 490 | 454 | +36 | ||||||||
| 2. | Dynamo Saint Petersburg | 6 | 3 | 3 | 439 | 438 | +1 | ||||||||
| 3. | Fenerbahçe | 6 | 3 | 3 | 474 | 483 | -9 | ||||||||
| 4. | CEZ Nymburk | 6 | 2 | 4 | 477 | 505 | -28 |
| width=15 | width=220 | Team | width=20 | Pld | width=20 | W | width=20 | L | width=20 | PF | width=20 | PA | width=30 | Diff | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Maroussi Honda | 6 | 5 | 1 | 393 | 387 | +6 | ||||||||
| 2. | RheinEnergie Köln | 6 | 4 | 2 | 458 | 426 | +32 | ||||||||
| 3. | Vertical Vision Cantu | 6 | 2 | 4 | 457 | 475 | -18 | ||||||||
| 4. | Dynamo Moscow Region | 6 | 1 | 5 | 447 | 467 | -20 |
| width=15 | width=220 | Team | width=20 | Pld | width=20 | W | width=20 | L | width=20 | PF | width=20 | PA | width=30 | Diff | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Lokomotiv Rostov | 6 | 4 | 2 | 462 | 431 | +31 | ||||||||
| 2. | Dexia Union Mons-Hainaut | 6 | 4 | 2 | 483 | 456 | +27 | ||||||||
| 3. | Zadar | 6 | 2 | 4 | 487 | 464 | +23 | ||||||||
| 4. | Slask Wroclaw | 6 | 2 | 4 | 411 | 492 | -81 |
| width=15 | width=220 | Team | width=20 | Pld | width=20 | W | width=20 | L | width=20 | PF | width=20 | PA | width=30 | Diff | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | Khimki | 6 | 4 | 2 | 487 | 447 | +40 | ||||||||
| 2. | DKV Joventut | 6 | 4 | 2 | 527 | 483 | +44 | ||||||||
| 3. | Azovmash | 6 | 4 | 2 | 452 | 443 | +9 | ||||||||
| 4. | Proteas EKA AEL | 6 | 0 | 6 | 486 | 579 | -93 |
| width=220 | Team #1 | width=20 | Agg. | width=220 | Team #2 | width=70 | 1st leg | width=70 | 2nd leg | width=70 | 3rd leg |
|---|---|---|---|---|---|---|---|---|---|---|---|
| BC Kyiv | 2 – 1 | 87 – 85 | 62 – 69 | 71 – 64 | |||||||
| Lokomotiv Rostov | 0 – 2 | DKV Joventut | 54 – 88 | 57 – 86 | |||||||
| BC Khimki | 2 – 1 | 91 – 75 | 73 – 79 | 94 – 78 | |||||||
| 0 – 2 | 53 – 64 | 59 – 71 |