A cheese sandwich is a sandwich made with cheese on bread. Typically, semi-hard cheeses are used for the filling, such as Cheddar, Red Leicester, or Double Gloucester. A Guardian article called the cheese sandwich a "British lunchtime staple". Using a sandwich toaster or frying pan can transform the cheese sandwich into a cheese toastie.

When a meat sandwich is prepared, the cheese becomes the accompaniment, and the sandwich is known by other names such as ham sandwich, tuna sandwich, etc. If the cheese is melted on such a sandwich, the term melt sandwich is used.

Popular British variants include the cheese and pickle sandwich, the cheese and tomato sandwich and the cheese and onion sandwich.

A grilled cheese sandwich is a popular American cheese sandwich, in which the sandwich is heated until the cheese melts.

An Italian variation is the carrozza, a mozzarella cheese sandwich coated in egg and flour and fried.

By 2014 the cheese sandwich was declining in popularity in the United Kingdom. A survey of 2,000 adults’ eating habits by YouGov in December 2014 found that 55% of British adults had not eaten a cheese sandwich during the previous week. In response, in 2015 Anchor Cheddar launched a campaign, using a bus designed to look like a cheese sandwich, to encourage the consumption of this type of food.

In 2017, a survey by YouGov found that 36% of British people said that cheese is their favourite sandwich filling, and in 2018, a survey of 2000 British people, found that a plain cheese sandwich was the most popular type of sandwich. By 2020 however, a similar study showed that the plain cheese sandwich had become less popular and the bacon sandwich was the favourite.

Cheese is a dairy product that comes in hundreds of different textures and flavors. It’s produced by adding acid or bacteria to milk from various farm animals, then aging or processing the solid parts of the milk. The nutrition and taste of cheese depend on how it is produced and what milk is used.

Some people are concerned that cheese is high in fat, sodium, and calories. However, cheese is also an excellent source of protein, calcium, and several other nutrients. Eating cheese may even aid weight loss and help prevent heart disease and osteoporosis. That said, some cheeses are healthier than others.

A breakfast grilled cheese is just as good as it sounds — gooey, melty cheese and fluffy scrambled eggs on golden, buttery toasted bread. And while it couldn’t be easier to whip up, there is one factor that’s absolutely critical: You need to pick a melty cheese.

Mozzarella is a soft cheese that’s lower in sodium and calories than most other cheeses. It also contains probiotics that may boost your immune system.

Blue cheese has distinctive blue or grey veins and a tangy taste. Loaded with calcium, it may promote bone health and help prevent osteoporosis.

Feta is a Greek cheese that’s higher in salt but lower in calories than other cheeses. It may also contain higher amounts of CLA, a fatty acid linked to improved body composition.

Cottage cheese is a fresh, clumpy cheese that’s loaded with protein. Adding cottage cheese to your diet can help keep you full and may aid weight loss.

Ricotta is a creamy, white cheese that’s loaded with protein. The high-quality whey found in ricotta may promote muscle growth and help lower blood pressure.

Parmesan is a low-lactose cheese that’s high in calcium and phosphorus, which may promote bone health.

Swiss cheese has less fat and sodium than most other cheeses and offers compounds that may help lower blood pressure. However, more research is needed.

Cheddar is rich in vitamin K2, a nutrient that prevents calcium from building up in your arteries and veins. Getting enough K2 may decrease your risk of heart disease.

Goat cheese is lower in lactose and contains proteins that may be more easily digested than those in cheeses from cow’s milk.