百日青（学名：Podocarpus neriifolius）亦称竹叶松，为罗汉松科的植物。

百日青为常绿乔木，高达25米，叶子互生或轮生，线状披针形，一般长7—15厘米，宽5—8毫米，中脉显着在两面突起似夹竹桃叶，种子球形，位于一肥大肉质的种托上。

Podocarpus neriifolius is a species of conifer in the Podocarpaceae family. It grows 10–15m tall, though very occasionally taller, in tropical and subtropical wet closed forests, between 650m and 1600m altitude. In Cambodia however it grows in a dwarf form some 2–4m tall, at Bokor, some 1000m elevation.