Andrew Donaldson (born 10 February 1991 in Irvine, Scotland) is a Scottish-Australian marathon swimmer, motivational speaker, and mental health advocate.

[9] In Perth, Donaldson co-founded Swimclan with his mentor Martin Smoothy to assist adults in learning to swim, improve their health, and pursue personal goals.

Donaldson's challenge raised significant funds and awareness for the Black Dog Institute, highlighting the importance of mental health.

[21][22] Despite this, he persisted and went on to break the British record for the Strait of Gibraltar and Catalina Channel swims, solidifying his place among the world's elite marathon swimmers.

In September 2024, Donaldson broke the world record for circumnavigating Manhattan Island, completing the 45.9 km swim in 5 hours, 41 minutes, and 48 seconds.

His Oceans Seven campaign raised significant funds for the Black Dog Institute, and he has supported other mental health organisations, including the Kai Fella Foundation.

In October 2023, Donaldson successfully completed a 33 km swim from Rottnest Island to Elizabeth Quay in Perth, raising money for Telethon and the Perron Institute for Neurological Science.