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Ridentem dicere verum quid vetat? - What forbids a laughing man from telling the truth? (Horace)
Rigor mortis - The rigidity of death
Risu inepto res ineptior nulla est - There is nothing more foolish than a foolish laugh. (Catullus)

Risus abundat in ore stultorum

Roma locuta est. Causa finita est - Rome has spoken. The cause is finished
Romani ite domum - Romans go home!
Romani quidem artem amatoriam invenerunt - You know, the Romans invented the art of love
Rosa rubicundior, lilio candidior, omnibus formosior, semper in te glorior - Redder than the rose, whiter than the lilies, fairer than everything, I will always glory in thee
Rumores volant. / Rumor volat - Rumors fly. / Rumor flies
Saepe creat molles aspera spina rosas - Often the prickly thorn produces tender roses. (Ovid)