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Mock-orange (Philadelphus; also Mockorange, Mock Orange) is a genus of about 60 species of shrubs from 1-6 m tall, native to North America, Central America, Asia and (locally) in southeast Europe. Most are deciduous but a few species from the south of the genus' range are evergreen. The leaves are opposite, simple, with serrated margins, from 1-14 cm long.

The flowers are white, with four petals and sepals, 1-4 cm diameter, and commonly (but not in all species) sweetly scented. The fruit is a small capsule, containing numerous small seeds. The bark is thin and flaky, finely shredding in longitudinal strips.

Lewis' Mock-orange is the state flower of Idaho.

Mock-oranges are popular shrubs in parks and gardens, grown for their reliable display of late spring flowers; the scented species are particularly valued. In addition to the species, there are numerous garden origin hybrids and cultivars available.

Species

• Philadelphus argenteus - Silver Mock-orange (California, Baja California)
• Philadelphus argyrocalyx - Silver-Cup Mock-orange (New Mexico)
• Philadelphus brachybotrys - Mock-orange (southeast China)
• Philadelphus californicus - California Mock-orange (California)
• Philadelphus caucasicus - Caucasus Mock-orange (Caucasus)
• Philadelphus confusus - Piper's Mock-orange
• Philadelphus cordifolius - Heartleaf Mock-orange (California)
• Philadelphus coronarius - Sweet Mock-orange (southeast Europe)
• Philadelphus coulteri - Coulter's Mock-orange (northwest Mexico)
• Philadelphus crinitus - Hairy or Trans-pecos Mock-orange (west Texas)
• Philadelphus delavayi - Delavay's Mock-orange (southwest China)
• Philadelphus ernestii - Canyon Mock-orange (southwest US)
• Philadelphus floridus - Florida Mock-orange (Florida, Georgia)
• Philadelphus gattingeri - Gattinger's Mock-orange
• Philadelphus hirsutus - Streambank Mock-orange (southeast US)
• Philadelphus hitchcockianus - Hitchcock Mock-orange
• Philadelphus incanus - Mock-orange (Hubei, Shaanxi)
• Philadelphus inodorus - Scentless Mock-orange (US)
• Philadelphus insignis - Summer Mock-orange (California, Oregon)
• Philadelphus intectus - Mock-orange (southeast US)
• Philadelphus kansuensis - Evergreen Mock-orange (northwest China)
• Philadelphus karwinskyanus - Evergreen Mock-orange (Mexico)
• Philadelphus laxiflorus - Mock-orange (Gansu, Hubei, Shaanxi)
• Philadelphus lewisii - Lewis' Mock-orange (western North America)
• Philadelphus maculatus - Spotted Mock-orange
• Philadelphus madrensis - Desert Mountain Mock-orange (southwest US)
• Philadelphus mearnsii - Mearns' Mock-orange
• Philadelphus mexicanus - Mexican Mock-orange (Mexico, Guatemala)
• Philadelphus microphyllus - Littleleaf Mock-orange (southwest US)
• Philadelphus occidentalis - Western Mock-orange (western North America)
• Philadelphus oreganus - Oregon Mock-orange (Oregon)
• Philadelphus palmeri - Palmer's Mock-orange (southwest US)
• Philadelphus pekinensis - Beijing Mock-orange (northern China)
• Philadelphus pubescens - Hoary Mock-orange (southeast US)
• Philadelphus pumilus - Dwarf Mock-orange
• Philadelphus purpurascens - Mock-orange (southwest China)
• Philadelphus satsumanus - Downy Japanese Mock-orange (Japan)
• Philadelphus satsumi - Japanese Mock-orange (Japan)
• Philadelphus schrenkii - Schrenk's Mock-orange (northeast China, Korea, southeast Russia)
• Philadelphus sericanthus - Mock-orange (Sichuan, Hubei)
• Philadelphus serpyllifolius - Littleleaf or Thymeleaf Mock-orange (southern US, Mexico)
• Philadelphus sharpianus - Sharp's Mock-orange ()
• Philadelphus subcanus - Mock-orange (southwest China)
• Philadelphus tenuifolius - Slender-leaf Mock-orange (Korea, southeast Russia)
• Philadelphus texensis - Texas Mock-orange (Texas)
• Philadelphus tomentosus - Fuzzy Mock-orange (Himalaya)
• Philadelphus trichothecus - Columbian Mock-orange (British Columbia, northwest US)
• Philadelphus triflorus - Himalayan Mock-orange (Himalaya)
• Philadelphus wootonii - Wooton's Mock-orange
• Philadelphus zelleri - Zeller's Mock-orange