Few studies have reported elemental fluxes of urban forests, which provide a variety of services and functions (e.g. entertainment) but suffer from chronic emissions by human activities (e.g. transport emission), especially for nitrogen (N) deposition. The present study was designed to monitor the bimonthly N fluxes of dissolved inorganic and organic N (DIN and DON) in bulk precipitation (BP), throughfall (TF) and stemflow (SF) over three years in Mt.Kinka forest site, which is located around Gifu Park in central Japan, to clarify N deposition level, temporal variation and canopy response to N deposition in the study site. The study showed that N inputs to the study site (TF + SF) amounted to 20.39 ± 1.65 kg N ha^–1 year^–1, with a great contribution from DIN (63%). The forest canopy enriched DIN (8.86 ± 1.46 kg N ha^–1 year^–1) and DON (1.35 ± 0.69 kg N ha^–1 year^–1). DIN enrichment flux by canopy showed regular temporal variation with higher flux during summer. This study indicates that canopy processes related to gathering and wash-off of dry deposition of DIN might have significant implication and contribution for N input to urban forest ecosystems.