#1 Arsenal (2003-04) - 49 matches
For generations, the fans of Preston North End could take pride in the fact that the Lilywhites had been the only club in the history of English football to go undefeated for an entire season. The club, which now competes in the Championship, achieved the remarkable feat in the very first season of the erstwhile football league in the 1888-89 campaign.
It was after 115 long years that another club was able to match their achievement. The Invincibles' squad of Arsenal from the 2003-04 season that counted Thierry Henry, Dennis Bergkamp, Patrick Viera, Ashley Cole and Fredrick Ljungberg in its ranks, went an entire season without losing a league game.
Including their two games from the 2002-03 season and nine games from the 2004-05 season, they had not lost a Premier League fixture for in 49 outings, falling just one short of a half-century. Their incredible run stretched from 7 May 2003 – 24 October 2004, a year and a half of total dominance over the league.
Their famous streak met its end in a rather infamous way. In a match held at the Old Trafford famously known as the Battle of the Buffet, two goals in a controversial second half of the game were enough to bring an end to one of the greatest footballing phenomena of the recent memory.
Also See: 5 Outstanding players who left Arsenal on a free transfer