Cllr Fran Grottick has said she is "grateful and obviously pleased" by the result of Thursday's Council election.
Fran received the second highest vote among the St Mary's candidates, polling 538. Robert Francis had the most votes on 576.
She told This is Scilly News: "I would like to thank those who put their faith in me.
"I realise it is quite a responsibility when there is still so much work to do."
She said of the new Council, which is without current Chairman Amanda Martin: "In these situations, we are guided by the wishes of the electorate."
Fran also played down rumours about who will be the new Chairman, saying: "There will be speculation but this is a decision for Members to make. I feel there is no need to rush, Full Council is on May 25th when the decision will be the first agenda item."
Fran has been a member of the Isles of Scilly Council since 2013.