悬浊液（英语：Suspension）也称为“悬浮液”或“悬胶”，在化学中指含有大到可以沉降的固体颗粒的非均相流体。

在药剂学中混悬剂是指难溶性固体药物以微粒状态分散于分散介质中形成的非均匀的液体制剂。混悬剂中药物微粒一般在0.5-10微米，小者可至0.1微米，大者可达50微米或更大。混悬剂属于热力学不稳定的粗分散体系。所用分散介质大多数为水，也可用植物油。

混悬剂的贮存存在物理稳定性问题。混悬剂中药物微粒分散度大，微粒与分散介质之间存在着物理界面，是混悬微粒具有较高的表面自由能，混悬剂处于不稳定状态。疏水性药物的混悬剂比亲水性药物存在更大的稳定性问题。

In chemistry, a suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than one micrometer. It is when particles are left floating around freely in a solvent. The internal phase (solid) is dispersed throughout the external phase (fluid) through mechanical agitation, with the use of certain excipients or suspending agents. Unlike colloids, suspensions will eventually settle. An example of a suspension would be sand in water. The suspended particles are visible under a microscope and will settle over time if left undisturbed. This distinguishes a suspension from a colloid, in which the suspended particles are smaller and do not settle. Colloids and suspensions are different from solutions, in which the dissolved substance (solute) does not exist as a solid, and solvent and solute are homogeneously mixed.