Penicuik turned Junior in 1951 with the supporter's club buying Eastfield Park from the National Coal Board and built a new pavilion.

Penicuik Athletic's biggest achievement is undoubtedly reaching the Scottish Junior Cup Final in 1970 at Hampden Park, Glasgow.

Here is how it was done in 1970: The team on Cup Final day: McDermott, Thorburn, McCabe, Hume, McGarry, Hogg, Robertson, Wallace, Stenhouse, Buchan, Murphy, Sub - Reeves.

The team continued to play despite the off-field problems and were showing signs of revival when a near fatal blow was delivered as the ground was sold on to be developed into a supermarket which stands on Eastfield Park today.

The last and ultimately successful project to establish a pitch which met the criteria laid down by the Scottish Junior Football Association grew out of an initiative by three local Midlothian Councillors, Russell Imrie, David Fletcher and Adam Montgomery to improve recreational facilities in Penicuik.

The presentation was made to the winner, Scott Anderson, age 11, from Mauricewood Primary, by Club President, John Fraser and Councillor Adam Montgomery.

Over 500 spectators turned up at the new pitch in Penicuik Park on Saturday 8 August to witness a no scoring draw in a league match against Harthill Royal.

Penicuik just missed out by a point on promotion to the first division after a 1–0 defeat in their final league match against West Calder which was controversially switched to be played on a Thursday night.

However, the club won its first trophy, the Supplementary Cup when a late Brian Hancock goal secured victory over Whitburn in the final played at Blackburn United's Murrayfield Park.

The cup winning team was: Bald, McDermott, Ure, Porteous, Blair, Montgomery, Dick, Hancock, Lindsay (Banks 73), Auld (Gibb 73), Forbes (Hope 73), Subs not used - Rennie, McLeod Further success was to follow for McGinley's side as they won the Lothians League Division Two title in 2004–05 with 41 points from 18 games played.

They narrowly avoided relegation with a last match win over Scottish Junior Cup finalists Kelty Hearts at Penicuik Park, in front of a 500+ crowd.

Manager McGinley stood down after six-years in charge in May 2008 and was replaced by his assistant Stuart 'Snowy' McKean, who had a distinguished junior playing career with Armadale Thistle and Bonnyrigg Rose.

A missed penalty in the last-minute, when the scores were level, proved costly in the first round Scottish Junior cup tie at Kilwinning as the home replay was lost.

The first season in the Super League saw Penicuik finish an impressive sixth, while also reaching the quarter-finals of the Scottish Junior Cup for the first time since 1970, though they lost out 2–0 to eventual finalists Musselburgh Athletic.

Season 2015-16 ended in success, as Penicuik defeated new Super League Champions Bonnyrigg Rose 3–1 in the Fife and Lothians Cup Final in June at Olivebank Stadium, thanks to goals from Darrell Young, Ryan McCallum and Sean Patterson.

However success was to come in the East of Scotland Cup, where the side would defeat the holders Tranent Juniors 2–0 in the final at Prestonfield thanks to goals from captain Craig Hume and Aaron Somerville.

[2] The club would be placed into Conference A, with their first match back in Senior Football coming against former Junior opponents Sauchie, in the group stages of the East of Scotland League Cup, a 3–1 win for Penicuik thanks to an Aaron Somerville hat-trick.

He would be succeeded by his former assistant manager Kevin Milne,[5] who would be joined as co-Manager by Tony Begg in December [6] and the duo would lead Penicuik to the Conference A title and into the East of Scotland Championship Playoffs, finishing second to Midlothian rivals Bonnyrigg Rose in the three-way round robin, Broxburn Athletic the other side.

The club took their place in the newly formed East of Scotland Premier Division for the 2019–20 season and returned to the Scottish Cup for the first time in over eighty years, winning back-to-back away Midlothian derbies in the preliminary rounds, against Easthouses Lily (6–1)[8] and Whitehill Welfare (1–0).