Tijs Velthuis (born 12 January 2002) is a Dutch professional footballer who plays as a centre-back for club PEC Zwolle on loan from Sparta Rotterdam.
Velthuis joined NAC Breda on a season-long loan deal on 13 July 2022, with an option to buy.
On 3 July 2023, Velthuis signed a contract with Sparta Rotterdam for the term of three years, with an additional option year.
On 7 August 2024, Velthuis moved to Salernitana in Italy on loan with an option to buy and a conditional obligation to buy.
On 23 January 2025, Velthuis moved on a new Serie B loan to Sassuolo, with an option to buy.
On 3 February 2026, Velthuis was loaned once again, to PEC Zwolle, with an option to buy.
Sassuolo