The R158 road is a regional road in Ireland, linking Trim in County Meath to Kilcock in County Kildare. The road, which is single-carriageway throughout, has been extensively realigned in recent years at a cost of €22m, the section between Kilcock and Summerhill having been completed by Fallon Construction in August 2008.

The road runs in a south-southeasterly direction from a junction with the R161 in Trim by way of Summerhill to a junction with the R148 in Kilcock.

• Roads in Ireland
• National primary road
• National secondary road

• Roads Act 1993 (Classification of Regional Roads) Order 2006 – Department of Transport