मधु या शहद एक मीठा, चिपचिपाहट वाला अर्ध तरल पदार्थ होता है जो मधुमक्खियों द्वारा पौधों के पुष्पों में स्थित मकरन्दकोशों से स्रावित मधुरस से तैयार किया जाता है और आहार के रूप में मौनगृह में संग्रह किया जाता है।

Honey is a sweet and viscous substance made by several species of bees, the best-known of which are honey bees. Honey is made and stored to nourish bee colonies. Bees produce honey by gathering and then refining the sugary secretions of plants or the secretions of other insects, like the honeydew of aphids. This refinement takes place both within individual bees, through regurgitation and enzymatic activity, and during storage in the hive, through water evaporation that concentrates the honey's sugars until it is thick and viscous.