Greenwich Students'​ Union | 4,019 followers on LinkedIn. We have one goal by 2026; supported by GSU and our services, you will Become Your Best at Greenwich and Beyond. | Welcome to the company page for Greenwich Students'​ Union. We are the membership organisation for the 20,000 students at the University of Greenwich. We are a charity and not-for-profit organisation - all of our profits go back into the Union to maintain and improve our services, events, facilities and activities.