Brügglen is a former municipality in the district of Bucheggberg, in the canton of Solothurn, Switzerland. On 1 January 2014 the former municipalities of Brügglen, Tscheppach, Aetingen, Aetigkofen, Bibern (SO), Gossliwil, Hessigkofen, Mühledorf (SO), Küttigkofen, Kyburg-Buchegg merged into the new municipality of Buchegg.

Brügglen is first mentioned in 1249 as Bruglon.

Before the merger, Brügglen had a total area of 1.7 km² (0.66 sq mi). Of this area, 0.94 km² (0.36 sq mi) or 54.7% is used for agricultural purposes, while 0.65 km² (0.25 sq mi) or 37.8% is forested. Of the rest of the land, 0.1 km² (25 acres) or 5.8% is settled (buildings or roads), 0.01 km² (2.5 acres) or 0.6% is either rivers or lakes.

Of the built up area, housing and buildings made up 4.1% and transportation infrastructure made up 1.7%. Out of the forested land, 35.5% of the total land area is heavily forested and 2.3% is covered with orchards or small clusters of trees. Of the agricultural land, 28.5% is used for growing crops and 25.0% is pastures, while 1.2% is used for orchards or vine crops. All the water in the municipality is flowing water.

The former municipality is located in the Bucheggberg district, on a small plateau in the Mittelbucheggberg. It consists of the haufendorf village (an irregular, unplanned and quite closely packed village, built around a central square) of Brügglen.

The blazon of the municipal coat of arms is Gules three Ears Or with four leaves of the same issuant from a Mount of 3 Coupeaux Vert and in Chief a Chevron embowed of the second.

Brügglen had a population (as of 2011) of 201. As of 2008^[update], 2.0% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 11.5%.

Most of the population (as of 2000^[update]) speaks German (185 or 98.9%), with Italian being second most common (1 or 0.5%) and Turkish being third (1 or 0.5%).