在粒子物理学里，强子（hadron）是一种由夸克或反夸克通过强作用力捆绑在一起的复合粒子。强子主要分为以下两大类：

另外，还有一些比较稀有的奇异强子：

在所有强子之中，只有质子是稳定的，束缚于原子核内的中子也是稳定的，其它种类的强子在普通状况都是不稳定的。自由中子会进行衰变，半衰期约为880秒。在实验方面，强子物理学研究通常会将质子或像铅一类的重元素原子核碰撞在一起，然后分析产生的粒子射丛。

In particle physics, a hadron /ˈhædrɒn/ (Greek:ἁδρός, hadrós, "stout, thick") is a composite particle made of quarks held together by the strong force in a similar way as molecules are held together by the electromagnetic force.

Hadrons are categorized into two families: baryons, made of three quarks, and mesons, made of one quark and one antiquark. Protons and neutrons are examples of baryons; pions are an example of a meson. Hadrons containing more than three valence quarks (exotic hadrons) have been discovered in recent years. A tetraquark state (an exotic meson), named the Z(4430), was discovered in 2007 by the Belle Collaboration and confirmed as a resonance in 2014 by the LHCb collaboration. Two pentaquark states (exotic baryons), named P+
c(4380) and P+
c(4450), were discovered in 2015 by the LHCb collaboration. There are several more exotic hadron candidates, and other colour-singlet quark combinations may also exist.