R-18 regional road (Montenegrin: Regionalni put R-18) (previously part of M-8 highway) is a Montenegrin roadway.

It connected Pljevlja with Foča in Bosnia and Herzegovina, and Prijepolje, Sjenica and Novi Pazar in Serbia.

[2] However, construction was never completed on the Montenegrin section of the road.

[3] In January 2016, the Ministry of Transport and Maritime Affairs published bylaw on categorisation of state roads.

[1] With new categorisation, part of M-8 highway (west of Pljevlja) was downgraded to regional road and named as R-18 regional road.