#4) Juventus (49) 2011/12
Juventus became the third Italian side to go the entire season of the Serie A without losing a match back in 2011/12. This was their first Serie A title in 9 years and would set off a run of consecutive title wins that still runs to this day.
Juventus would go on to become the Italian side with the second longest run without a loss. However, their streak ended with one short of half a century after a loss to Inter Milan. Regardless, the side would go on to become the most dominant side of the last decade.
#3) Arsenal (49) 2003/04
Perhaps the most famous of these lists, Arsenal became the first team in the Premier League to go an entire season without losing a game. Arsene Wenger’s side saw off challenges from Manchester United and the cash infused Chelsea to create history.
The side is renowned for its attack, led by Thierry Henry. However, the side was just as efficient at the back, conceding a mere 26 goals in the entire season. Such was the dominance of Gunners, that Arsene Wenger was being hailed, and rightfully so, as Sir Alex Ferguson’s first true equal.
Arsenal’s run finally came to an end after a controversial loss to Manchester United in the following season. Unfortunately for the North London club, this loss would eventually signal the end of their Era. Despite still being a big club, the side have never challenged for the Premier League since.