The 27-year-old will be with the Terriers until May 3, and cannot be recalled during the loan period.
Edgar, who joined Birmingham from Burnley in June last year, has made 19 appearances for Gary Rowett's side this season.
He previously had spells with Newcastle United and Swansea City, and has won 26 caps for his native Canada.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| 1 | Birmingham CityBirmingham | 28 | 20 | 6 | 2 | 50 | 19 | 31 | 66 |
| 2 | Wycombe WanderersWycombe | 29 | 17 | 8 | 4 | 55 | 30 | 25 | 59 |
| 3 | Wrexham | 29 | 16 | 7 | 6 | 43 | 25 | 18 | 55 |
| 4 | Stockport CountyStockport | 31 | 15 | 9 | 7 | 47 | 30 | 17 | 54 |
| 5 | Charlton AthleticCharlton | 30 | 14 | 8 | 8 | 40 | 29 | 11 | 50 |
| 6 | Huddersfield TownHuddersfield | 29 | 14 | 7 | 8 | 41 | 26 | 15 | 49 |
| 7 | Leyton Orient | 29 | 14 | 5 | 10 | 43 | 25 | 18 | 47 |
| 8 | Bolton WanderersBolton | 30 | 14 | 5 | 11 | 47 | 46 | 1 | 47 |
| 9 | Reading | 30 | 13 | 7 | 10 | 44 | 42 | 2 | 46 |
| 10 | Barnsley | 30 | 12 | 7 | 11 | 42 | 41 | 1 | 43 |
| 11 | Blackpool | 30 | 9 | 13 | 8 | 42 | 41 | 1 | 40 |
| 12 | Lincoln CityLincoln | 30 | 10 | 10 | 10 | 36 | 35 | 1 | 40 |
| 13 | Stevenage | 29 | 11 | 7 | 11 | 28 | 30 | -2 | 40 |
| 14 | Rotherham UnitedRotherham | 30 | 10 | 8 | 12 | 34 | 35 | -1 | 38 |
| 15 | Mansfield TownMansfield | 29 | 11 | 4 | 14 | 35 | 38 | -3 | 37 |
| 16 | Wigan AthleticWigan | 28 | 9 | 7 | 12 | 27 | 28 | -1 | 34 |
| 17 | Northampton TownNorthampton | 30 | 8 | 9 | 13 | 29 | 45 | -16 | 33 |
| 18 | Exeter CityExeter | 29 | 9 | 5 | 15 | 33 | 46 | -13 | 32 |
| 19 | Bristol Rovers | 29 | 9 | 5 | 15 | 29 | 45 | -16 | 32 |
| 20 | Peterborough UnitedPeterborough | 30 | 8 | 6 | 16 | 46 | 57 | -11 | 30 |
| 21 | Shrewsbury TownShrewsbury | 30 | 7 | 6 | 17 | 31 | 50 | -19 | 27 |
| 22 | Crawley TownCrawley | 29 | 7 | 6 | 16 | 33 | 53 | -20 | 27 |
| 23 | Burton Albion | 30 | 5 | 11 | 14 | 31 | 45 | -14 | 26 |
| 24 | Cambridge UnitedCambridge | 30 | 5 | 8 | 17 | 30 | 55 | -25 | 23 |
| > League One Full Table | |||||||||
