Vodafone Group plc, a British mobile phone operator headquartered in Newbury, Berkshire, England, is the largest mobile telecommunications network company in the world by turnover, with equity interests in 27 countries and Partner Networks (networks in which it has no equity stake) in a further 31 countries. Its name stands for VOice DAta FONE (phone).

31 December 2005 Vodafone had 179.3 million proportionate customers in 27 markets across 5 continents. ("Proportionate customers" means, for example, that if Vodafone has a 30% stake in a business with a million customers, that is counted as 300,000). On this measure it is the second-largest mobile telecom group in the world behind China Mobile. The six markets where it has more than ten million proportionate customers are the United Kingdom; Germany, the United States, Italy, Japan, and Spain. In the U.S., these customers come via its minority stake in Verizon Wireless, and in the other five markets Vodafone has majority-controlled subsidiaries.

Vodafone is listed on the London Stock Exchange as Vodafone Group (LSE: VOD.L) and New York Stock Exchange, symbol VOD.