环炔烃是具有环内碳碳三键的环状脂肪烃，通式为C_nH2n-4。

由于张力的作用，小环环炔烃的张力很大，不能稳定存在。常温下最小的稳定态环炔烃为八碳结构的环辛炔。

乙酰基 · 乙酰氧基 · 醇 · 醛 · 烷烃 · 烯烃 · 炔烃 · 烷氧基 · 酰胺 · 胺 · 偶氮化物 · 苯 · 羧酸 · 硫代羧酸 · 氰酸酯 · 双硫键 · 酯 · 醚 · 环氧化合物 · 卤代烷 · 腙 · 羟基 · 亚胺 · 异氰酸酯 · 异腈 · 异硫氰酸酯 · 酮 · 次甲基 · 腈 · 硝基化合物 · 亚硝基化合物 · 有机磷 · 肟 · 过氧化物 · 亚磷酸二酯与膦酸酯 · 吡啶 · 砜 · 磺酸 · 亚磺酸 · 次磺酸 · 硒酸 · 亚砜 · 硫氰酸酯 · 硫酯 · 硒酯 · 硫醚 · 硫醇 · 硒醇 · 碲醇 · 尿素 · 酸酐

In organic chemistry, a cycloalkyne is the cyclic analog of an alkyne. A cycloalkyne consists of a closed ring of carbon atoms containing one or more triple bonds. Cycloalkynes have a general formula C_nH_2n−4. Because of the linear nature of the C–C≡C–C alkyne unit, cycloalkynes can be highly strained and can only exist when the number of carbon atoms in the ring is great enough to provide the flexibility necessary to accommodate this geometry. Large alkyne-containing carbocycles may be virtually unstrained, while the smallest constituents of this class of molecules may experience so much strain that they have yet to be observed experimentally. Cyclooctyne (C₈H₁₂) is the smallest cycloalkyne capable of being isolated and stored as a stable compound. Despite this, smaller cycloalkynes can be produced and trapped through reactions with other organic molecules or through complexation to transition metals.