This is a multicenter, randomized, parallel design, double-blind study of mometasone furoate (MF) in pediatric subjects with perennial allergic rhinitis. The subjects 5 to 15 years of age with perennial allergic rhinitis will enter a no-treatment observation period of 7 days at minimum and eligibility for inclusion in this study will be assessed. Following the observation period, eligible subjects will be randomized to MF or MF placebo for a 2-week double-blind treatment. At each clinic visit (at the start of treatment and after 1 and 2 weeks of treatment or at discontinuation), nasal symptom scores, nasal findings, and adverse events (AEs), will be evaluated. A 30-day follow-up visit will take place after the completion (or discontinuation) of the 2-week treatment period, to confirm presence or absence of serious adverse events (SAEs) and trial procedure-related AEs.