- Name: 5 Josh Mattern
- Nationality: —
- Position: D
- Shot: Left
- DOB: 02/1/2025
- Height: 5-2
- Weight: 135
- Hometown: Wilcox, SK
- 2019-20 Team:
- 2018-19 Team: Notre Dame Hounds U14 AA
- 2017-18 Team: Notre Dame Hounds U14 AA
- USHL Status: 2020
- NHL Draft Eligible: 2022/23