In international rallying, R5 refers to a class of cars competing under Group R regulations. R5 regulations were introduced by the Fédération Internationale de l'Automobile (FIA) in 2012 as a replacement for the Super 2000 class. In 2019 the FIA renamed the R5 specification ruleset to Group Rally2 as part of a wider plan to reorganise FIA championships and replace Group R with new Groups Rally. Existing FIA homologated R5 cars remain eligible for any FIA Rally2 level competition, and non-homologated R5 or Rally2 cars should be accepted equally at national level where approved. R5/Rally2 cars are based on production cars and feature a 1600cc turbocharged petrol engine.

In relation to motorsport governed by the Fédération Internationale de l'Automobile, Group R refers to a set of regulations providing production-derived vehicles for rally competition. The Group R regulations were gradually introduced from 2008 as a replacement for Group A and Group N rally cars.