The 21-year-old, who has been with the Terriers since 2009, had loan spells with Brentford and Crawley Town last season.
Huddersfield boss Mark Robins told the club's official website: "Scunthorpe are a team who expect to be pushing for promotion so it should be a challenge for Jimmy."
Spencer has made three appearances for Huddersfield.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Kidderminster HarriersKidderminster | 25 | 15 | 4 | 6 | 41 | 19 | 22 | 49 |
| 2 | King's Lynn TownKing's Lynn | 27 | 14 | 6 | 7 | 35 | 27 | 8 | 48 |
| 3 | Chester FCChester | 26 | 13 | 7 | 6 | 39 | 27 | 12 | 46 |
| 4 | Brackley Town | 25 | 14 | 4 | 7 | 33 | 22 | 11 | 46 |
| 5 | Scunthorpe UnitedScunthorpe | 26 | 12 | 9 | 5 | 42 | 19 | 23 | 45 |
| 6 | Curzon AshtonCurzon Ashton | 24 | 14 | 3 | 7 | 32 | 19 | 13 | 45 |
| 7 | Chorley | 24 | 11 | 7 | 6 | 34 | 28 | 6 | 40 |
| 8 | Darlington | 25 | 10 | 9 | 6 | 32 | 26 | 6 | 39 |
| 9 | Hereford UnitedHereford | 25 | 10 | 8 | 7 | 33 | 25 | 8 | 38 |
| 10 | Buxton | 25 | 12 | 2 | 11 | 40 | 34 | 6 | 38 |
| 11 | Alfreton TownAlfreton | 25 | 10 | 7 | 8 | 32 | 30 | 2 | 37 |
| 12 | South Shields | 25 | 11 | 3 | 11 | 40 | 37 | 3 | 36 |
| 13 | Spennymoor TownSpennymoor | 25 | 8 | 11 | 6 | 40 | 29 | 11 | 35 |
| 14 | Peterborough SportsP'boro Sports | 26 | 9 | 8 | 9 | 31 | 32 | -1 | 35 |
| 15 | Scarborough AthleticScarborough Ath | 26 | 8 | 9 | 9 | 36 | 33 | 3 | 33 |
| 16 | Leamington FCLeamington | 25 | 9 | 5 | 11 | 33 | 31 | 2 | 32 |
| 17 | SouthportSouthport | 25 | 8 | 8 | 9 | 28 | 34 | -6 | 32 |
| 18 | Oxford CityOxford City | 24 | 7 | 7 | 10 | 36 | 41 | -5 | 28 |
| 19 | Warrington Town | 27 | 5 | 9 | 13 | 22 | 37 | -15 | 24 |
| 20 | Farsley CelticFarsley Celtic | 26 | 7 | 3 | 16 | 26 | 51 | -25 | 24 |
| 21 | RadcliffeRadcliffe | 23 | 5 | 7 | 11 | 28 | 42 | -14 | 22 |
| 22 | Marine AFC | 25 | 5 | 6 | 14 | 17 | 34 | -17 | 21 |
| 23 | Rushall Olympic | 27 | 6 | 3 | 18 | 26 | 57 | -31 | 21 |
| 24 | Needham Market | 25 | 4 | 7 | 14 | 18 | 40 | -22 | 19 |
| > National League North Full Table | |||||||||
