Sejs-Svejbæk is a railway town, with a population of 4,608 (1 January 2024). It is located in Silkeborg Municipality, Central Jutland Region in Denmark, 7 km southeast of Silkeborg.

Sejs-Svejbæk is served by Svejbæk railway station, located on the Skanderborg–Skjern railway line.

Sejs-Svejbæk Church, whose floor plan is modelled on a Roman bacilica with chancel, nave and aisles, was inaugurated in 1989.

• Lars Larsen, businessman, founder of Jysk, lived in Sejs-Svejbæk from 1982 until his death
• Esben Bjerre Hansen, radio and television personality