These lists include all players who have made at least one appearance in a competitive match for the Bethlehem Steel FC since the team's first USL season in 2016. Players who have been listed on the team's roster but have not made any appearances are not listed.
United League Soccer clubs are allowed a roster of 30 players at any one time during the USL season.
| Name | Position | Country | Acquired From | Years | Games | Minutes | Goals | Assists | |
|---|---|---|---|---|---|---|---|---|---|
| MF |  United States | Philadelphia Union Academy | 2017– | 25 | 1267 | 1 | 5 | ||
| MF |  Nigeria | New York Red Bulls II | 2016 | 26 | 2,176 | 0 | 0 | ||
| FW | United States | New York Red Bulls | 2018 | 7 | 362 | 2 | 0 | ||
| MF | United States | Southern California Seahorses | 2018 | 17 | 752 | 2 | 0 | ||
| DF | United States |  Toronto FC II | 2018 | 28 | 2,346 | 0 | 0 | ||
| MF |  Cameroon | Philadelphia Union | 2016–2018 | 21 | 1,736 | 4 | 1 | ||
| DF | United States | Saint Louis FC | 2016 | 12 | 698 | 1 | 0 | ||
| FW |  Jamaica | St George's College | 2016–2017 | 11 | 183 | 0 | 0 | ||
| FW | Jamaica | Rivoli United F.C. | 2016–2018 | 50 | 3,595 | 15 | 6 | ||
| MF |  Brazil | Philadelphia Union | 2016 | 6 | 169 | 0 | 0 | ||
| MF | United States | Philadelphia Union | 2017 | 2 | 152 | 0 | 0 | ||
| MF | United States | University of Wisconsin | 2018 | 10 | 256 | 0 | 2 | ||
| MF | St Patrick's Athletic F.C. | 2016– | 85 | 7,050 | 13 | 5 | |||
| DF | Kafu Celtic FC | 2018 | 16 | 1355 | 1 | 0 | |||
| DF | Brazil | Philadelphia Union | 2016 | 13 | 1,132 | 0 | 0 | ||
| FW |  Liberia | FC Oss | 2016–2017 | 44 | 2,611 | 12 | 2 | ||
| DF | United States | Sacramento Republic FC | 2016 | 17 | 1,321 | 1 | 0 | ||
| FW | United States | Philadelphia Union | 2017 | 1 | 90 | 1 | 0 | ||
| MF | United States | Philadelphia Union | 2016–2017 | 6 | 336 | 0 | 0 | ||
| DF | Philadelphia Union | 2017–2018 | 2 | 165 | 0 | 0 | |||
| MF | United States | Philadelphia Union | 2017–2018 | 25 | 1,997 | 1 | 2 | ||
| MF | Brazil | Philadelphia Union | 2016 | 14 | 1,193 | 1 | 0 | ||
| MF | United States | Philadelphia Union Academy | 2016–2018 | 35 | 2,254 | 1 | 0 | ||
| FW | Liberia | Sacramento Republic FC | 2016 | 18 | 690 | 1 | 0 | ||
| FW | United States | Philadelphia Union Academy | 2017– | 1 | 17 | 0 | 0 | ||
| MF | Canada | Washington Huskies | 2016–2017 | 39 | 1,197 | 2 | 0 | ||
| FW | Philadelphia Union | 2016–2018 | 23 | 1,725 | 8 | 4 | |||
| MF | Jamaica | Real Salt Lake | 2018 | 11 | 249 | 2 | 0 | ||
| DF | Philadelphia Union | 2017 | 30 | 2,577 | 2 | 1 | |||
| MF |  Ghana | Philadelphia Union Academy | 2016–2018 | 53 | 4,503 | 10 | 3 | ||
| MF | United States | Philadelphia Union Academy | 2017– | 1 | 6 | 0 | 0 | ||
| FW | United States | Lehigh Mountain Hawks | 2016 | 16 | 581 | 0 | 0 | ||
| DF | United States | Temple University | 2017–2018 | 44 | 3,454 | 2 | 0 | ||
| DF | United States | Philadelphia Union | 2017–2018 | 8 | 671 | 1 | 0 | ||
| DF | Cameroon | Rainbow FC | 2018 | 24 | 2,152 | 0 | 3 | ||
| MF | United States | Philadelphia Union Academy | 2017 | 3 | 155 | 0 | 0 | ||
| DF | United States | Philadelphia Union Academy | 2016–2018 | 10 | 831 | 0 | 0 | ||
| MF | United States | Philadelphia Union Academy | 2016– | 9 | 262 | 0 | 0 | ||
| MF | United States | Philadelphia Union | 2016 | 19 | 842 | 0 | 1 | ||
| FW |  Spain | Pfeiffer University | 2017–2018 | 65 | 4,252 | 12 | 15 | ||
| MF | United States | Philadelphia Union Academy | 2016– | 5 | 110 | 0 | 0 | ||
| MF | United States | Philadelphia Union | 2017–2018 | 39 | 3,291 | 5 | 10 | ||
| MF | Canada | Syracuse University | 2017–2018 | 61 | 3,012 | 9 | 6 | ||
| FW | Montverde Academy | 2018 | 24 | 1,494 | 7 | 0 | |||
| DF | United States | Philadelphia Union Academy | 2018– | 12 | 931 | 1 | 0 | ||
| MF | SW Florida Adrenaline | 2018 | 1 | 90 | 0 | 0 | |||
| MF | United States | Philadelphia Union Academy | 2017– | 2 | 180 | 0 | 0 | ||
| FW | Montverde Academy | 2018– | 15 | 807 | 3 | 0 | |||
| FW | United States | Philadelphia Union Academy | 2018– | 2 | 50 | 0 | 0 | ||
| FW | United States | Philadelphia Union Academy | 2017– | 2 | 15 | 0 | 0 | ||
| DF | United States | Philadelphia Union Academy | 2016– | 21 | 1,836 | 2 | 1 | ||
| MF |  Colombia | Philadelphia Union | 2016 | 8 | 602 | 0 | 1 | ||
| DF | United States | University of Kentucky | 2017 | 9 | 636 | 0 | 0 | ||
| DF | United States | Ottawa Fury FC | 2016 | 29 | 2,610 | 5 | 4 | ||
| DF | United States | Richmond Kickers | 2017 | 26 | 2,091 | 1 | 0 | ||
| DF | United States | Philadelphia Union | 2017 | 1 | 90 | 0 | 0 | ||
| MF | United States | Philadelphia Union Academy | 2016–2017 | 21 | 562 | 0 | 1 | ||
| FW | Canada | Philadelphia Union Academy | 2016 | 3 | 59 | 0 | 0 | ||
| FW | Canada | Philadelphia Union Academy | 2018 | 7 | 159 | 0 | 0 | ||
| DF | United States | Philadelphia Union | 2016–2017 | 13 | 1,128 | 1 | 1 | ||
| DF | United States | Philadelphia Union Academy | 2016–2017 | 44 | 3,960 | 0 | 2 | ||
| DF | United States | Philadelphia Union | 2016 | 28 | 2,473 | 0 | 0 | ||
| DF | Philadelphia Union | 2017 | 7 | 615 | 0 | 0 | |||
| MF |  Norway | University of New Hampshire | 2017 | 6 | 361 | 0 | 0 | ||
| DF | Ghana | Philadelphia Union | 2016–2018 | 15 | 1,208 | 0 | 0 |
| Name | Country | Acquired From | Years | Games | Minutes | Conceded | GAA | Shutouts | |
|---|---|---|---|---|---|---|---|---|---|
| United States | Colorado Springs Switchbacks | 2016 | 10 | 900 | 16 | 1.60 | 2 | ||
| Philadelphia Union | 2016 | 5 | 450 | 6 | 1.20 | 0 | |||
| United States | Philadelphia Union | 2016–2018 | 26 | 2,340 | 31 | 1.19 | 10 | ||
| United States | Philadelphia Union | 2017–2018 | 46 | 4,140 | 56 | 1.22 | 10 | ||
| United States | New Jersey Copa SC | 2016–2017 | 4 | 360 | 7 | 1.75 | 0 | ||
 El Salvador | Philadelphia Union | 2017– | 8 | 720 | 17 | 2.13 | 0 |