Following his nomination from City defender Alan Sheehan, Parkinson stuck to his word and held his nerve as a bucket of ice cold water was poured over his head at the club's Apperley Bridge training ground.
The ice bucket challenge aims to raise awareness about the disease and to help raise funds to try and find ways to treat it.
ALS or Amyotrophic Lateral Sclerosis is a neurodegenerative disease that can eventually affect and/or disable nearly all bodily functions, including muscle and joint movement.
City supporters can read more about ALS by clicking HERE.
Fans can also see the City boss taking the challenge - and see who he nominates - by clicking on the video link below!