| Club: | 1. FSV Mainz 05 II |
| Season: | 2015–16 |
| Manager: | Sandro Schwarz |
| Stadium: | Stadion am Bruchweg |
| League: | 3. Liga |
| League Result: | Pre-season |
| Pattern La1: | _fsvmainz1415h |
| Pattern B1: | _fsvmainz1415h |
| Pattern Ra1: | _fsvmainz1415h |
| Leftarm1: | FF0000 |
| Body1: | FF0000 |
| Rightarm1: | FF0000 |
| Shorts1: | FF0000 |
| Socks1: | FF0000 |
| Pattern B2: | _fsvmainz1415a |
| Leftarm2: | FFFFFF |
| Body2: | FFFFFF |
| Rightarm2: | FFFFFF |
| Shorts2: | FFFFFF |
| Socks2: | FFFFFF |
| Updated: | 19 June 2015 |
| Prevseason: | 2014–15 |
The 2015–16 1. FSV Mainz 05 II season is the 2nd consecutive season in the 3. Liga, having been promoted from the Regionalliga Südwest in 2014. The club's home stadium is the Stadion am Bruchweg, located in Mainz, Germany. The stadium has a capacity of 18,000 seats.
In the club's previous season in the 3. Liga, they finished in 16th place, 3 points from the relegation zone.
See main article: 2015–16 3. Liga.