| Country: | IRL |
| Type: | R |
| Image Notes: | Construction site by the R623 on Little Island |
| Route: | 623 |
| Length Km: | 3.5 |
| Terminus A: | N25 at Inchera, County Cork |
| Terminus B: | N25 at Courtstown |
| Previous Type: | R |
| Previous Route: | 622 |
| Next Type: | R |
| Next Route: | 624 |
The R623 road is a regional road in County Cork, Ireland. It is a loop road on Little Island from the N25. The R623 is 3.5km (02.2miles) long.