Irumashi Station (入間市駅, Irumashi-eki) is a passenger railway station located in the city of Iruma, Saitama, Japan, operated by the private railway operator Seibu Railway.

Irumashi Station is served by the Seibu Ikebukuro Line from Ikebukuro in Tokyo, with some services inter-running via the Tokyo Metro Yurakucho Line to Shin-Kiba and the Tokyo Metro Fukutoshin Line to Shibuya and onward via the Tokyu Toyoko Line and Minato Mirai Line to Motomachi-Chukagai. Located between Inariyama-kōen and Bushi, it is 36.8 km from the Ikebukuro terminus.

The station consists of a ground-level side platform and two island platforms, serving a total of four tracks.

Platforms 1 and 2 share the same track. Limited express trains usually stop at Platform 2 in the down direction and Platform 5 in the up direction.

The station opened on 15 April 1915 as Toyooka-machi Station (豊岡町駅). It was renamed Irumashi on 1 April 1967.

Station numbering was introduced on all Seibu Railway lines during fiscal 2012, with Irumashi Station becoming "SI23".

Through-running to and from Yokohama and Motomachi-Chukagai via the Tokyu Toyoko Line and Minatomirai Line commenced on 16 March 2013.

In fiscal 2019, the station was the 28th busiest on the Seibu network with an average of 33,713 passengers daily. The passenger figures for previous years are as shown below.