A filling station (also known as a gas station [US] or petrol station [UK/AU]) is a facility that sells fuel and engine lubricants for motor vehicles. It serves as a local fuel depot and retailer who receive fuel products from refineries (via regular tank truck resupplies), keep the fuels in (typically underground) storage tanks, and distribute individual product to motorist consumers at a daily varied price.

The most common fuels sold are motor fuels such as gasoline (a.k.a. petrol, often as multiple products according to different octane ratings) and diesel fuel, as well as liquified petroleum gas (LPG, i.e. autogas), compressed natural gas, compressed hydrogen, hydrogen compressed natural gas, liquid hydrogen, kerosene, alcohol fuels (like methanol, ethanol, butanol, and propanol), biofuels (like straight vegetable oil and biodiesel), or other types of alternative fuels. Fuel dispensers are used to pump fuel into the fuel tanks within vehicles, gauge the volume of fuel transferred to the vehicle, and calculate the financial cost of the consumer needs to pay. Besides fuel pumps, one other significant device which is also found in filling stations and can refuel certain (compressed-air) vehicles is an air compressor, although generally these are just used to inflate car tires.

Many filling stations provide convenience stores, which may sell convenience food, beverages, tobacco products, lottery tickets, newspapers, magazines, and, in some cases, a small selection of grocery items, such as milk or eggs. Some also sell propane or butane and have added shops to their primary business. Conversely, some chain stores, such as supermarkets, discount stores, warehouse clubs, or traditional convenience stores, have provided fuel pumps on the premises.

In North America, the colloquial generic term for motor fuels is "gasoline" or "gas" for short due to gasoline engines being the most ubiquitous car internal combustion engine, and the terms "gas station" and "service station" are used in the United States, Canada, and the Caribbean. In some regions of Canada, the term "gas bar" (or "gasbar") is used.

In the rest of the English-speaking world, the generic term for fuel is "petrol", which was originally the brand of a petroleum distillate made by Carless Refining and Marketing Ltd as a mineral oil solvent. As a result, the term "petrol station" or "petrol pump" is used in the United Kingdom. In Ireland, New Zealand and South Africa "garage" and "forecourt" are still commonly used. Similarly, in Australia, New Zealand, the United Kingdom, and Ireland, the term "service station" describes any petrol station; Australians and New Zealanders also call it a "servo". In India, Pakistan and Bangladesh, it is called a "petrol pump" or a "petrol bunk". In Japanese, a commonly used term is gasoline stand although the abbreviation SS (for service station) is also used.

The first known filling station was the city pharmacy in Wiesloch, Germany, where Bertha Benz refilled the tank of the first automobile on its maiden trip from Mannheim to Pforzheim back in 1888. Shortly thereafter other pharmacies sold gasoline as a side business. Since 2008 the Bertha Benz Memorial Route commemorates this event.

The first "posto de gasolina" of South America was opened in Santos, São Paulo, Brazil, in 1920. It was located on Ana Costa Avenue, in front of the beach, in a corner that is located by the Hotel Atlântico, which occupies its area nowadays. It was owned by Esso and brought by Antonio Duarte Moreira, a taxi entrepreneur.

In Russia, the first filling stations appeared in 1911, when the Imperial Automobile Society signed an agreement with the partnership "Br. Nobel". By 1914 about 440 stations functioned in major cities across the country.