Martyn Day is a Scottish National Party politician who has represented constituencies in the Falkirk and Linlithgow area at both Westminster and Holyrood. Born on 26 March 1971, he was elected as Member of Parliament for Linlithgow and East Falkirk in 2015, serving in that capacity until 2024. During his time at Westminster, Day held the position of SNP Spokesperson for Health from December 2021 to September 2023, focusing on health policy matters for his party.

In May 2026, Day transitioned to the Scottish Parliament, becoming the Member of the Scottish Parliament for Falkirk East and Linlithgow. Throughout his political career, he has developed expertise in health policy and has been an advocate for his constituents in central Scotland. Day writes commentary for Comment Central.