The 1877 Wimbledon Championship was a men's tennis tournament held at the All England Croquet and Lawn Tennis Club (AEC & LTC) in Wimbledon, London. It was the world's first official lawn tennis tournament, and was later recognised as the first Grand Slam tournament or "Major". The AEC & LTC had been founded in July 1868, as the All England Croquet Club; lawn tennis was introduced in February 1875 to compensate for the waning interest in croquet. In June 1877 the club decided to organise a tennis tournament to pay for the repair of its pony roller, needed to maintain the lawns. A set of rules was drawn up for the tournament, derived from the first standardised rules of tennis issued by the Marylebone Cricket Club in May 1875.

The Gentlemen's Singles competition, the only event of the championship, was contested on grass courts by 22 players who each paid one guinea to participate. The tournament started on 9 July 1877, and the final – delayed for three days by rain – was played on 19 July in front of a crowd of about 200 people who each paid an entry fee of one shilling. The winner received 12 guineas in prize money and a silver challenge cup, valued at 25 guineas, donated by the sports magazine The Field. Spencer Gore, a 27-year-old rackets player from Wandsworth, became the first Wimbledon champion by defeating William Marshall, a 28-year-old real tennis player, in three straight sets in a final that lasted 48 minutes. The tournament made a profit of £10 and the pony roller remained in use. An analysis made after the tournament led to some modifications of the rules regarding the court dimensions.