High Sheriff of West Sussex, Mrs Caroline Nicholls, and Worthing deputy mayor Hazel Thorpe unveiled the window on Thursday, at a celebration forum where representatives from a large number of community groups gathered for the final send-off.
The organisation will close on January 31, as Worthing Borough Council withdraw its funding in 2016 and the short-term funding that has kept it going since has now dried up.
Mrs Nicholls said: “I came here expecting to feel sad because I have seen the value of what you have achieved in the town.
“It doesn’t feel like an end, it feels a bit like the end of the school year. I have got a huge sense of energy building in the room.”
Hazel Thorpe, deputy mayor, added: “I felt really gutted when I heard but you have to move on.”
The glass window will be one of a dozen glass windows to be launched on the pier on February 18.
Referencing Adur and Worthing Community Works, which has replaced Voluntary Action Worthing, Mrs Nicholls said: “You have got a lot to build on. We will all be egging you on and giving our support.”