However, the club was dissolved in 1933 as it was regarded as "politically unreliable" by the Nazis and was not re-established until after the end of World War II in 1945 to resume play in the amateur fourth division B-Klasse.

Continued good play put the team into the fourth-division Landesliga Bayern-Süd in 1979 and then the Oberliga Bayern (III), the highest amateur division at the time, by 1981.

They went on to surprise everyone with a respectable 10th-place result in their inaugural Bundesliga season and also famously played the spoiler's role in deciding who would win the championship that year.

While struggling in away matches, Unterhaching remained undefeated at home in nine games before losing 0–2 to their stronger neighbours, Bayern Munich.

Prior to this loss, they had earned wins at home in matches against highly favoured teams like VfB Stuttgart and Borussia Dortmund, beating them 2–0 and 1–0 respectively.

On the final matchday of the season, visiting Bayer Leverkusen needed only a draw in Unterhaching to secure their first national title, but instead went down to defeat to the determined home side.

Things took a sinister turn for Leverkusen when Michael Ballack scored an own goal that put home side ahead in the 20th minute.

Meanwhile, Bayern Munich beat Werder Bremen 3–1 at home and were able to overtake Leverkusen on goal difference to snatch away the title.

Goalkeeper Gerhard Tremmel, defenders Alexander Strehmel and Jochen Seitz, midfielders Markus Oberleitner and André Breitenreiter and striker Altin Rraklli were among the most memorable players of a team that impressed by its discipline.

Bayern then had to make their own way to the championship with at least a draw against Hamburger SV which they only narrowly managed on a Patrik Andersson equalizer (1–1) deep into stoppage time.

Needing an away win in their final match of the season in order to avoid being sent down to the Regionalliga Süd (III), they instead went down to a 0–3 defeat to Karlsruher SC and finished in 15th place.

Liga, the club was close to promotion, but a loss 3–4-loss against Carl Zeiss Jena on the 37th matchday earned them a fall from second to fourth place, and a prolonged stay in the third league.

2008–09's successful coach Ralph Hasenhüttl got replaced by the 1990-world champion Klaus Augenthaler, who led the team to a finish on a secure 11th place.

The Grünauer Allee stadium is now home ground of the club's reserve squad, Haching II, which is currently playing in the fourth-division Oberliga Bayern.

The Grünauer Allee stadium is also the home ground of Fortuna Unterhaching, established in 1992 and playing close to the bottom end of the German league system.

Numerous Olympic medals and world championship titles make Christoph Langen Unterhaching's outstanding bobsledder.