Pieter Aren Grinwis (born 12 October 1979) is a Dutch politician, who has been serving as a member of the House of Representatives on behalf of the Christian Union since March 2021.

He grew up in that village with his two younger brothers and attended the Middelharnis secondary school CSG Prins Maurits at vwo level.

[3][4][5][6][7] Grinwis subsequently studied economics of agriculture and environment at Wageningen University and Research, but he did not finish his program due to an illness and a scooter accident.

[12] He replaced a staff worker, who was on parental leave, the following year and got a permanent position as policy officer of the House caucus in 2004.

[22] While in the municipal council, Grinwis also worked as a financial advisor for the Christian Union caucus in the House of Representatives and the Senate.

[34] He served as his party's spokesperson for agriculture, nature, food quality, finances, climate, energy, water management, housing, spatial planning, economic affairs, and infrastructure.

[36][37] In the House, Grinwis also proposed for policy officers of the Ministry of Agriculture, Nature and Food Quality to be encouraged to intern at farms, nature organizations, and the NVWA, and he unsuccessfully called for a halt to the construction of new data centers due to their footprint and energy usage, when one in Zeewolde for Facebook was nearing approval.

[38][39] He brought forward a compromise in May 2022 when D66 and GroenLinks wanted to abolish unelected members of water councils through an initiative bill.

[41] Furthermore, Grinwis submitted an initiative bill with Henk Nijboer (Labour Party) to prohibit temporary rental contracts for houses in most cases.

They had been allowed since 2016 to increase the stock of rental homes and accounted for one third of new contracts, but Grinwis argued that they had been ineffective and had caused uncertainty among renters.