The main award - chosen by shoppers - from Tesco's Bags of Help fund (derived from the plastic bags charge) has gone to Alzheimer Scotland Lewis & Harris, for their Dementia Friendly Snooker Club.
Alzheimer Scotland Lewis & Harris said: "We are delighted to be awarded the main award of £4000.
"The activity is now up and running and folks are already enjoying their game of snooker or pool.
"This is a great boost to our much-needed local fundraising. We really appreciate all the support we get from the community - it makes a big difference and supports us greatly in our work!
Stornoway Tesco also announced that the Macaulay College Stornoway Petting Zoo Access For All project will receive £2000.
Meanwhile, An Radio Uist's Skills Holiday Club will receive £1000.
Stornoway Tesco said: "A huge thank you to our customers for voting and well done to all the groups."