The Edinburgh Diamond Devils baseball club was formed in 1986, although baseball has existed in the city since the 1930's when it was played at US air bases at Kirknewton and East Fortune. Initially named the Edinburgh Royals, the team was involved in the inaugural Scottish League in 1988 and since then have enjoyed a long and rich history.

League success came in 1991, two years after the 'Royals' became the 'Reivers' with the team claiming its first Scottish Championship. 1992 saw the team repeat as national champions, becoming the first team to do so in league history and saw the start of the clubs first youth team, the Blue Jays.

1993 and 1994 were barren years for the team as Glasgow and Dundee emerged as national powers, however 1995 saw a significant change in team fortunes. Long-time General Manager Donald Brotchie retired from baseball and junior team head coach Nick Clark assumed the mantle of responsibility. A superb Reivers team was assembled which won the national title with an 11-1 record for the first time in 3 years. The team aslo won the Scottish Cup tournament. Double glory was secured when the Blue Jays won the first ever Scottish Junior League title with a 10-0 record. 1995 will forever be known as the year the organisation turned the corner and emerged as one of the biggest and best baseball clubs in Britain.

1996 saw the Reivers relinquish their title after a 6-6 season but 1997 and 1998 saw the team return to power with a back-to-back 11-1 seasons and another two titles.

In 1999, as a result of the creation of a new Edinburgh rugby team called the Reivers, the club changed to the Edinburgh Diamond Devils and left the Scottish League to join the British Baseball League - Division 1. This was a first for a Scottish team. Hard work paid off with a successful first foray in to this league with the Devils gaining promotion to the top-flight of British baseball with a 15-3 record, the BBF Premier Division. In addition, the team became a major supporter of the Scotland National Team and 15 Devils were selected for an international match with England staged at Meadowbank Stadium, Edinburgh. Although defeated 11-13, Team Scotland enjoyed a tremendous occasion with almost 1000 fans turning out to see the game. 1999 also saw the expansion of the teams youth programme to incorporate a 4 team youth league within the city and a school development scheme called ' Pitch, Hit and Run' which provides baseball for children in 17 schools across the city.

2000 saw the Devils endure a tough winless first season of Premier League baseball but it ended with a glorious Team Scotland victory over England by a score of 18-5 in the annual international.

2001 saw the team win the Northern Conference's Division 1, becoming the first Scottish team to win a British title, losing only once all year. The team also qualified for the June 2001 C.E.B. (Confederation of European Baseball)Cup tournament in Prague. This was to have been the first time ever that a Scottish team had entered a European competition but the event was moved to the Ukraine and the visit was not sanctioned by the BBF.

2002 was a disappointing year as the club missed out on the play-offs after a 9-9 season.

2003 was the year that European glory came Edinburgh's way as the team ventured to Brasschaat in Belgium to play in the CEB Cup B pool event, finishing 7th. The Devils would become the first Scottish team to ever play in a CEB tournament. The club also won their division in the Northern Conference before falling to Hull in the playoffs.

2004 saw another trip to Europe as the team played in the CEB European Cup B Pool tournament in Rouen in France finishing tied for 5th. Domestically, the club entered play in the new National League North, the highest level of baseball in Great Britain, in its quest to reach the BBF Final Four. A win/loss of 10-12 would see the Devils finish 4th in the National League, missing out on the playoffs.

2005 would see the club enjoy a 2nd place finish in the National League North and make more history, returning to play in Europe for the third straight year in The CEB Cup - Qualifying Pool tournament held in Utena, Lithuania from the 13th to the 19th of June. A creditable 5th place finish against teams from countries neighbouring Lithuania would further establish the club's credentials in Europe. The Devils participation would also mark the first time a UK side had played in a CEB tournament over three straight years. The year would be capped by victory in the Scottish Challenge Cup over the Strathclyde Falcons by a score of 18-8.

2006 saw the Devils enjoy a competitive National League season finishing 14-11 on the year but missing out on the playoffs by half a game. Europe beckoned once again and the team travelled to Belgium for a second time in 4 years to battle in the CEB European Cup - Qualifying Pool. Despite returning winless, the team benefitted greatly from the experience after a stuttering start to the season. The year was capped in fine fashion by victory over the Strathclyde Falcons by a score of 18-12 to retain the Scottish Cup.

2007 would see the restart of a Scottish National League with the Edinburgh Diamond Devils forming two sides to participate in the new venture, the Edinburgh Devils and Edinburgh Eagles. The Devils would go on to secure the title with a 14-1 record whilst the Eagles would finish third. However, the club would also relinquish the Scottish Cup to Strathclyde.

2008 season proved to be one of mixed fortunes for the Edinburgh teams in the SNL. An early strong showing for the Eagles would prove fruitless as they fell away whilst the defending champion Devils would battle hard but ultimately end up two games off the title which went to the GBA. However, a combined team reclaimed the 2008 Scottish Cup to end the season on a high.