The Middle Party for City and Country (in Dutch: Middenpartij voor Stad en Land, MPSL) was a Dutch political party defending the interests of the middle class.
Vos came into conflict with Staalman over his support for a law on mandatory closing times for shops.
The party wanted to increase public wealth by reducing the restrictions for trade, industry and agriculture.
The electorate of the Middle Party was concentrated in Amsterdam and the Gooi, a region around Hilversum, where Vos came from.
The party drew its main support from farmers and the middle class.