| State: | CO |
| Type: | SH |
| Route: | 55 |
| Map: | Colorado State Highway 55 Map.svg |
| Map Notes: | Map of Logan County in northeastern Colorado with SH 55 highlighted in red |
| Length Mi: | 5.659 |
| Length Ref: | [1] |
| Direction A: | South |
| Terminus A: | CR 81 near Fleming |
| Junction: | near Crook |
| Direction B: | North |
| Terminus B: | in Crook |
| Counties: | Logan |
| Previous Type: | SH |
| Previous Route: | 53 |
| Next Type: | SH |
| Next Route: | 56 |
State Highway 55 (SH 55) is a 5.6591NaN1 long state highway in the U.S. state of Colorado. SH 55's southern terminus is at County Road 81 northeast of Fleming, and the northern terminus is at SH 138 in Crook. It serves as a connector between Crook and Interstate 76 (I-76).
SH 55 runs 5.7miles, starting at a junction with U.S. Highway 138 in Crook, then south across the South Platte River to I-76. The highway ends at CR 81 northeast of Fleming.