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| Route information | ||||
| Maintained by Ghana Highways Authority | ||||
| Length | 88.23 mi (141.99 km) | |||
| Major junctions | ||||
| West end |  N1 at Mankessim | |||
| East end |  N4 at Aburi | |||
| Location | ||||
| Country | Ghana | |||
| Major cities | Esiam | |||
| Highway system | ||||
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The IR1 or Inter-Regional Highway 1 is a highway in Ghana that begins at Mankessim in the Central Region and runs through Agona Swedru and Nsawam to Aburi. It runs parallel to the N1 between the Central and Eastern regions, and has a total distance of 142 kilometers (88.23 miles). The route runs through the Central, Greater Accra and Eastern regions of Ghana.
The IR1 links the N1 in the Central region to the N6 in Eastern region.