Egliswil is a municipality and village in the district of Lenzburg in the canton of Aargau in Switzerland.
It appears that there was a Roman estate in Egliswil, though the only archeological evidence is a single Roman era grave. The modern village of Egliswil is first mentioned in 924 as Egirichiswilare. In 1331 the Habsburgs pledged the low justice rights to the Lords of Hallwyl. They merged Egliswil into the court of Hallwil. In 1677 they raised the, now much larger, village into its own independent court. The Untervogtei was placed in the Haus zum Sonnenberg a stone building from 1694.
The romanesque aisleless church, with a churchtower from the 16th century, was a branch of the church in Seengen.
In addition to grain, the main businesses of the village were vineyards (since the 17th century) and home working for the cotton industry (from 18th century). From the 1950s, small-scale industry moved into the edge of the village.
Egliswil is located in the Lenzburg district, in a depression on the right edge of the lower Seetal valley. The larger village of Seon is 2km distant (measured from centre-to-centre) — the small Aabach river forms part of the boundary between the municipalities. In Seon is the nearest railway station to Egliswil.