Spinus may refer to:

• Spinus (genus), a genus of birds in the finch (Fringillidae) family
• Spinuș, a commune in Bihor County, Romania

• Hydroestril
• Hydroestryl
• Hydroflight sports
• Hydroflouric Acid
• Hydrofluoroolefins
• Hydrofunctionalization
• Hydrogel agriculture
• Hydrogel dressing
• Hydrogel dressings
• Hydrogen:2-(2,3-dihydropentaprenyloxy)phenazine oxidoreductase
• Hydrogen:5,10-methenyltetrahydromethanopterin oxidoreductase
• Hydrogen absorption line
• Hydrogen:acceptor oxidoreductase
• Hydrogenated Poly-1-Decene
• Hydrogenated polydec-1-ene
• Hydrogenated starch
• Hydrogen battery
• Hydrogenbenzoquinonetetracarboxylate
• Hydrogen bond catalysis
• Hydrogen-boron fusion
• Hydrogen-bridged cations
• Hydrogencarbonate indicator
• Hydrogen chalcide
• Hydrogen chalcogenide
• Hydrogen cloud