Ranidaphobia - Fear of frogs.

Rectophobia - Fear of rectum or rectal diseases.

Rhabdophobia - Fear of being severely punished or beaten by a rod, or of being severely criticized. Also fear of magic.

Rhypophobia - Fear of defecation.

Rhytiphobia - Fear of getting wrinkles.

Rupophobia - Fear of dirt.

Russophobia - Fear of Russians.