| Clubname: | Željezničar Doboj |
| Fullname: | Fudbalski klub Željezničar Doboj |
| Nickname: | Željo |
| Founded: | 1933 |
| Ground: | 15 April |
| Capacity: | 2000 |
| Chairman: | Mihajlo Marković |
| Manager: | Ratko Nikolić |
| League: | Second League RS – West |
| Season: | 2015–16 |
| Position: | Second League RS – West, 13th |
| Pattern La1: | _porto0809 |
| Pattern B1: | _porto0809 |
| Pattern Ra1: | _porto0809 |
| Pattern So1: | _bluetop |
| Leftarm1: | FFFFFF |
| Body1: | FFFFFF |
| Rightarm1: | FFFFFF |
| Shorts1: | 003399 |
| Socks1: | FFFFFF |
| Kit Alt2: | Yellow jersey, dark gray shorts and socks |
| Leftarm2: | FF0000 |
| Body2: | FF0000 |
| Rightarm2: | FF0000 |
| Shorts2: | FF0000 |
| Socks2: | FFFFFF |
Fudbalski klub Željezničar Doboj (Serbian Cyrillic: Фудбалски клуб Жeљeзничap Дoбoj) is a football club based in Doboj, Republika Srpska, Bosnia and Herzegovina. Serbian: Željezničar meaning "railwayman" is a common name for sports clubs associated with railway workers.