Vestsjællands Amt (English: West Zealand County) is a county (Danish, amt) in the east-central part of the island of Zealand (Sjælland) in eastern Denmark. It is one of the 13 counties of Denmark.

The county is responsible for public hospitals, upper secondary schools and schools for Higher Preparatory Examination, public transport and social welfare for the disabled.

The County Hall is located in the city of Sorø. Sorø is by no means the biggest city in West Zealand, but it has great historical value. It is for instance home to Sorø Academy (Danish, Sorø Akademi), an educational institution built in 1140 together with the church where Queen Margaret I of Denmark was buried (later moved to Roskilde Domkirke, Roskilde).

Many people live in West Zealand but work in the greater metropolitan area of Copenhagen.

Municipalities:Bjergsted municipality ;Dianalund municipality ;Dragsholm municipality ;

Fuglebjerg municipality ;Gørlev municipality ;Hashøj municipality ;Haslev municipality ;

Holbæk municipality ;Hvidebæk municipality ;Høng municipality ;Jernløse municipality ;

Kalundborg municipality ; Korsør municipality ;Nykøbing-Rørvig municipality ;

Ringsted municipality ;Skælskør municipality; Slagelse municipality; Sorø municipality ;

Stenlille municipality; Svinninge municipality ;Tornved municipality ;Trundholm municipality ;Tølløse municipality.