Jacob Mulder (born 11 August 1995) is an Irish cricketer. He made his Twenty20 International (T20I) debut against Hong Kong on 5 September 2016. He made his One Day International (ODI) debut against the United Arab Emirates on 4 March 2017. He made his first-class debut for Northern Knights in the 2017 Inter-Provincial Championship on 1 August 2017. In 2020, he finished his career playing in Ireland, before returning to Australia.