| Club: | Sanfrecce Hiroshima |
| Season: | 2018 |
| Chairman: | Kaoru Koyano |
| Owner: | Mazda |
| Manager: | Hiroshi Jofuku |
| Stadium: | Hiroshima Big Arch |
| League: | 2018 J1 League |
| Cup1: | 2018 Emperor Cup |
| Cup2: | 2018 J-League Cup |
| Cup3: | 2018 J League Asia Challenge |
| Largest Win: | 4–0 (A) v. Gamba Osaka (J1 League Cup) |
| Largest Loss: | 1–3 (A) v. FC Tokyo (J.League 10) 0–2 (H) v. Cerezo Osaka (J.League 15) |
| Pattern La1: | _sanfrecce18h |
| Pattern B1: | _sanfrecce18h |
| Pattern Ra1: | _sanfrecce18h |
| Pattern Sh1: | _sanfrecce18h |
| Pattern So1: | _sanfrecce17h |
| Leftarm1: | 2F0048 |
| Body1: | 2F0048 |
| Rightarm1: | 2F0048 |
| Shorts1: | 2F0048 |
| Socks1: | EBFF00 |
| Pattern La2: | _sanfrecce18a |
| Pattern B2: | _sanfrecce18a |
| Pattern Ra2: | _sanfrecce18a |
| Pattern Sh2: | _sanfrecce18a |
| Pattern So2: | _sanfrecce18a |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | EBFF00 |
| Updated: | 17 June 2018 |
| Prevseason: | 2017 |
| Nextseason: | 2019 |
The 2018 Sanfrecce Hiroshima season was the club's tenth consecutive season in J1 League, and 48th overall incompeted Japanese top flight. Sanfrecce Hiroshima also competed in the Emperor's Cup, J.League Cup, and J.League Asia Challenge.