Another American League East team founded in 1901, this team, of course, being founded as the Milwaukee Brewers, then became the St. Louis Browns, and finally the Baltimore Orioles in 1954.
Despite being in the league for so long, the team was only able to win the World Series on three occasions, 1966, 1970, and 1983.
So when you compare those three teams for the best season ever, you have to pick the 1970 team as the best just based off of their dominance that season. The team went 108-54, 15 games ahead of the Yankees in the AL East, and ten games better than the second-best team in the AL which was the Twins, who had 98 wins. The team went on a historic run through the postseason, only losing once, sweeping the Twins in the ALCS and beating the Reds in five games in the World Series. Back then the ALCS was a best of 5, so in their eight games played in the 1970 postseason, the Orioles scored 60 runs.
The team was headlined by Boog Powell, who was the AL MVP. Powell hit .297, had 35 HRs and 114 RBIs.
Playing alongside Powell in Baltimore were three future Hall of Famers; Brooks Robinson, Frank Robinson, and Jim Palmer were all on the 1970 O's team and have been inducted into Cooperstown. Plus, the team was managed by a Hall of Famer in Earl Weaver.
Their pitching headlined the team boasting three - yes, three - 20-game winners in David McNally (24-9), Mike Cuellar (24-8), and Palmer (20-10). Palmer also had five shutouts that season. As a whole staff, the team had a league-best 3.15 ERA, was second in walks at 469, and fourth in strikeouts with 941.
One of the most dominant teams in the history of baseball and one of the best of all time put the 1970 team as the best season in Baltimore Orioles history.