Showalter was hired as a senior advisor to baseball operations for the Cleveland Indians on December 1, 2006, and then returned to ESPN as an analyst, before being appointed to succeed Juan Samuel as manager of the Baltimore Orioles on July 29, 2010. He chose to wear uniform number 26 as a tribute to Johnny Oates. Signed to a contract through the 2013 campaign, he inherited a ballclub with the worst record in the majors at 32–73. In his debut as manager on August 3, the Orioles recorded a 6-3 win over the Los Angeles Angels of Anaheim at Oriole Park, leading to a three-game sweep. The team's first-ever season series sweep of the Angels was completed by the end of the month. The 2010 Orioles won 34 of 57 games played under Showalter, second only to the Phillies during the same stretch.  Showalter became the first manager in MLB history to take over a team in August and coach them to more wins for the remainder of a season, than the team previously had before hiring him.

He managed the 1,000th victory of his major-league career in a 7–1 triumph at Yankee Stadium on May 1, 2012. Showalter finished the 2012 season with a .574 winning percentage, winning 93 games, and ending a streak of losing seasons for the Orioles at 14.

Under Showalter, the Orioles reached the postseason for the first time since 1997, defeating the Texas Rangers in a one-game playoff on October 5, 2012. The Orioles were later defeated by the New York Yankees in the 2012 American League Division Series, 3 games to 2. Showalter was named the AL Manager of the Year by The Sporting News.  He has re-signed through 2018 with the Orioles.

After finishing out of play-off contention in the 2013 season, Showalter led the 2014 Orioles to the AL East title--the franchise's first in 17 years. The Orioles subsequently swept the Detroit Tigers (3-0) in the ALDS for Showalter's first major league ALDS title, before being swept themselves (4-0) by the Kansas City Royals in the ALCS.

On November 11, 2014, Showalter won his third AL Manager of the Year award, his first since 2004

[Source: Wikipedia]