精包（英语：Spermatophore，亦称为精荚或精子包囊）是一种由黏液黏在一起的精子群，由部分涡虫类、蛭类、头足类、有尾类等雄性动物黏腺分泌形成。在交配时被移送入雌虫体内。在昆虫类中，精包在雌体内降解；在蝾螈类中，精包在雌性泄殖腔中被吸收。

A spermatophore or sperm ampulla is a capsule or mass containing spermatozoa created by males of various animal species, especially salamanders and arthropods, and transferred in entirety to the female's ovipore during reproduction. Spermatophores may additionally contain nourishment for the female, in which case it is called a nuptial gift, as in the instance of bush crickets. In the case of the toxic moth Utetheisa ornatrix, the spermatophore includes sperm, nutrients, and pyrrolizidine alkaloids (PA) which prevent predation because it is poisonous to most organisms. However, in some species such as the Edith's Checkerspot butterfly, the "gift" provides little nutrient value. The spermatophore transferred at mating has little effect on female reproductive output. The alternative hypothesis of its usefulness is that the process of eating the spermatophore prevents the female from subsequent copulation, thereby giving the male's sperm more time to fertilize.