Blood as food is the usage of blood in food, religiously and culturally. Many cultures consume blood, often in combination with meat. The blood may be in the form of blood sausage or other solidified form, as a thickener for sauces, a cured salted form for times of food scarcity, or in a blood soup. This is a product from domesticated animals, obtained at a place and time where the blood can run into a container and be swiftly consumed or processed. In many cultures, the animal is slaughtered. In some cultures and religions, blood is a taboo food. In Singapore the sale of blood products for consumption is illegal.

Blood consists predominantly of protein and water, and is sometimes called "liquid meat" because its composition is similar to that of lean meat. Blood collected hygienically can be used for human consumption, otherwise it is converted to blood meal. Certain fractions of animal blood are used in human medicine.

Blood sausage is any sausage made by cooking animal blood with a filler until it is thick enough to congeal when cooled. Pig or cattle blood is most often used. Typical fillers include meat, fat, suet, bread, rice, barley and oatmeal. Varieties include biroldo, black pudding, blood tongue, blutwurst, drisheen, kishka (kaszanka), morcilla, moronga, mustamakkara, sundae, verivorst, and many types of boudin.

Blood pancakes are encountered in Galicia (filloas), Scandinavia, and the Baltic; for example, Swedish blodplättar, Finnish veriohukainen, and Estonian veripannkoogid.

Blood soups and stews, which use blood as part of the broth, include czernina, dinuguan, haejangguk, mykyrokka, pig's organ soup, tiet canh and svartsoppa.

Blood is also used as a thickener in sauces, such as coq au vin or pressed duck, and puddings, such as tiết canh. It can provide flavor or color for meat, as in cabidela.

Blood can also be used as a solid ingredient, either by allowing it to congeal before use, or by cooking it to accelerate the process. Blood curd is a dish typically found in Asia that consists of cooled and hardened animal blood.

In China, "blood tofu" (Chinese: 血豆腐; pinyin: xiě dòufǔ) is most often made with pig's or duck's blood, although chicken's or cow's blood may also be used. The blood is allowed to congeal and simply cut into rectangular pieces and cooked. This dish is also known in Java as saren, made with chicken's or pig's blood. Blood tofu is found in curry mee as well as the Sichuan dish, Mao Xue Wang (Chinese: 毛血旺; pinyin: máo xuè wàng). Chinese people use pig blood, tofu, and vegetables to make a healthy soup. This soup has a reputation as a healthy and tasty meal in China.