Below is a comprehensive list of protein

Protein in nutrition

Proteins are polymer chains made of amino acids linked together by peptide bonds. Proteins and carbohydrates contain 4 kcal per gram as opposed to lipids which contain 9 kcal per gram....

 content in foods, organised by food group. The protein content is measured in grams of protein per 100 g of an edible portion of food, without referring to the quality of the protein. For the sake of clarity, these units have been systematically removed in the following.
Cheese

Cheese

Cheese is a generic term for a diverse group of milk-based food products. Cheese is produced throughout the world in wide-ranging flavors, textures, and forms....

 - protein content range: 7.0 to 40.6

• high scores: parmesan 35.76 to 41.6; gruyère
  Gruyère (cheese)
  Gruyère is a hard yellow cheese, named after the town of Gruyères in Switzerland, and originated in the cantons of Fribourg, Vaud, Neuchâtel, Jura, and Berne...
  
   29.8; traditional cheddar
  Cheddar cheese
  Cheddar cheese is a relatively hard, yellow to off-white, and sometimes sharp-tasting cheese, produced in several countries around the world. It has its origins in the English village of Cheddar in Somerset....
  
   24.9 to 27.2
• average scores: camembert
  Camembert
  Camembert is a commune in the Orne department in north-western France.It is most famous as the place where camembert cheese originated.Camembert has been called "The largest small village in France." This is because the area of the commune itself is out of proportion to the center of the village...
  
   19.8; processed cheddar 16.42 to 24.6
• low scores: feta
  Feta
  Feta is a brined curd cheese traditionally made in Greece. Feta is an aged crumbly cheese, commonly produced in blocks, and has a slightly grainy texture. It is used as a table cheese, as well as in salads Feta is a brined curd cheese traditionally made in Greece. Feta is an aged crumbly cheese,...
  
   14.7; ricotta
  Ricotta
  Ricotta is an Italian dairy product made from sheep milk whey left over from the production of cheese. Although typically referred to as ricotta cheese, ricotta is not properly a cheese because it is not produced by coagulation of casein...
  
   11.26 to 11.39

Whole chicken egg - 10.62 to 13.63 (cooked)

Milks:

• Cow milk (fluid, raw or pasteurized) - 3.3 to 3.97
• Soy milk
  Soy milk
  Soy milk and sometimes referred to as soy drink/beverage is a beverage made from soybeans. A stable emulsion of oil, water, and protein, it is produced by soaking dry soybeans and grinding them with water...
  
   2.75 to 7.5

Meat and mock meat

Common red meats:

• Beef
  Beef
  Beef is the culinary name for meat from bovines, especially domestic cattle. Beef can be harvested from cows, bulls, heifers or steers. It is one of the principal meats used in the cuisine of the Middle East , Australia, Argentina, Brazil, Europe and the United States, and is also important in...
  
   meat, cooked - 16.91 to 40.6
  • high scores: braised eye-of-round steak 40.59; broiled t-bone steak (porterhouse) 32.11
  • average scores: baked lean ground beef
    Ground beef
    Beef mince, ground beef, hamburger meat , hamburg or minced meat is a minced meat food, made of beef finely chopped by a mincer. It is used in many recipes including hamburgers and cottage pie...
    
     24.47
  • low scores: corned beef
    Corned beef
    Corned beef is a type of salt-cured beef products present in many beef-eating cultures. The English term is used interchangeably in modernity to refer to three distinct types of cured beef:...
    
    : 16.91

Meat oddities:

• Bearded seal
  Bearded Seal
  The bearded seal , also called the square flipper seal, is a medium-sized pinniped that is found in and near to the Arctic Ocean. It gets its generic name from two Greek words that refer to its heavy jaw...
  
   game meat, dried: 82.6
• Moose
  Moose
  The moose or Eurasian elk is the largest extant species in the deer family. Moose are distinguished by the palmate antlers of the males; other members of the family have antlers with a dendritic configuration...
  
   game meat, dried: 79.5
• Beaver
  Beaver
  The beaver is a primarily nocturnal, large, semi-aquatic rodent. Castor includes two extant species, North American Beaver and Eurasian Beaver . Beavers are known for building dams, canals, and lodges . They are the second-largest rodent in the world...
  
   game meat, broiled: 23.0.

White meat

Fish

Fish

Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

Mock meat (cooked vegetarian preparations): 18.53 to 23.64

Vegetables, grain and pulses

Vegetables:

• Nori
  Nori
  is the Japanese name for various edible seaweed species of the red alga Porphyra including most notably P. yezoensis and P. tenera, sometimes called laver. Finished products are made by a shredding and rack-drying process that resembles papermaking...
  
   seaweed, dried sheets: 36.24
• ready-to-eat green vegetables: 0.33 to 3.11
• ready-to-eat starchy tubers: 0.87 to 6.17
  • high scores: home-prepared potato
    Potato
    The potato is a starchy, tuberous crop from the perennial Solanum tuberosum of the Solanaceae family . The word potato may refer to the plant itself as well as the edible tuber. In the region of the Andes, there are some other closely related cultivated potato species...
    
     pancakes 6.17; French fries
    French fries
    French fries , chips, fries, or French-fried potatoes are strips of deep-fried potato. North Americans tend to refer to any pieces of deep-fried potatoes as fries or French fries, while in the United Kingdom, Australia, Ireland and New Zealand, long, thinly cut slices of deep-fried potatoes are...
    
     3.18-4.03
  • average scores: baked potato 2.5; boiled yam
    Yam (vegetable)
    Yam is the common name for some species in the genus Dioscorea . These are perennial herbaceous vines cultivated for the consumption of their starchy tubers in Africa, Asia, Latin America and Oceania...
    
     1.49
  • low scores: boiled sweet potato
    Sweet potato
    The sweet potato is a dicotyledonous plant that belongs to the family Convolvulaceae. Its large, starchy, sweet-tasting, tuberous roots are an important root vegetable. The young leaves and shoots are sometimes eaten as greens. Of the approximately 50 genera and more than 1,000 species of...
    
     0.87.

Legumes:

• dry roasted soybeans: 39.58
• peanuts
  Peanut
  The peanut, or groundnut , is a species in the legume or "bean" family , so it is not a nut. The peanut was probably first cultivated in the valleys of Peru. It is an annual herbaceous plant growing tall...
  
   (raw, roasted, butter): 23.68 to 28.04.

Baked products:

• Wholewheat pancakes:
• Bread
  Bread
  Bread is a staple food prepared by cooking a dough of flour and water and often additional ingredients. Doughs are usually baked, but in some cuisines breads are steamed , fried , or baked on an unoiled frying pan . It may be leavened or unleavened...
  
  : 6.7 to 11.4
• Cracker
  Cracker (food)
  A cracker is a baked good commonly made from grain flour dough and typically made in quantity in various hand-sized or smaller shapes. Flavorings or seasonings, such as salt, herbs, seeds, and/or cheese, may be added to the dough or sprinkled on top before baking...
  
  s: 7.43 to 13.9.

Other food elements

Natural protein concentrates (often used in bodybuilding

Bodybuilding

Bodybuilding is a form of body modification involving intensive muscle hypertrophy. An individual who engages in this activity is referred to as a bodybuilder. In competitive and professional bodybuilding, bodybuilders display their physiques to a panel of judges, who assign points based on their...

 or as sports dietary supplements):

• Soy protein
  Soy protein
  Soy protein is a protein that is isolated from soybean. It is made from dehulled, defatted soybean meal. Dehulled and defatted soybeans are processed into three kinds of high protein commercial products : soy flour, concentrates, and isolates. Soy protein isolate has been used since 1959 in foods ...
  
   isolate (prepared with sodium or potassium): 80.66
• Whey
  Whey
  Whey or Milk Serum is the liquid remaining after milk has been curdled and strained. It is a by-product of the manufacture of cheese or casein and has several commercial uses. Sweet whey is manufactured during the making of rennet types of hard cheese like cheddar or Swiss cheese...
  
   protein isolate: 79.5
• Egg white
  Egg white
  Egg white is the common name for the clear liquid contained within an egg. In chickens it is formed from the layers of secretions of the anterior section of the hen's oviduct during the passage of the egg. It forms around either fertilized or unfertilized egg yolks...
  
  , dried: 79.0
• Spirulina alga, dried: 57.45 (more often quoted as 55 to 77)
• Baker's yeast
  Baker's yeast
  Baker's yeast is the common name for the strains of yeast commonly used as a leavening agent in baking bread and bakery products, where it converts the fermentable sugars present in the dough into carbon dioxide and ethanol...
  
  : 38.33

It is to be noted that not all protein is equally digestible. Protein Digestibility Corrected Amino Acid Score (PDCAAS

PDCAAS

Protein Digestibility Corrected Amino Acid Score is a method of evaluating the protein quality based on both the amino acid requirements of humans and their ability to digest it...

) is a method of evaluating the protein quality based on the amino acid requirements of humans.