Former Hull MP Colin Challen secured the second seat in the Castle ward behind Independent candidate Janet Jefferson.
He polled 433 votes to beat off competition from Ros Fox.
He said: “I’m pleased to be able to represent the town that I was born in and represent the ward where I live and work.”
Cllr Challen said the council’s environmental policy needed to be revised and was interested in cultural matters. He added: “They are important for Scarborough and tourists alike.”
Central ward voters maintained a status quo after Cllr David Billing and Cllr Eric Broadbent retained their seats.
The Labour party duo both won with a convincing 350 and 304 votes respectively. Cllr Broadbent said: “I am delighted that the Central ward has returned both its councillors, we have worked very hard for several years and we hope to work even harder now.”
Cllr Billing added: “I thank the people for putting their trust in the both of us.”
Labour’s joy also extended to the Falsgrave where former journalist John Ritchie claimed a seat alongside Independent candidate Pat Marsburg.
Mr Ritchie, who was previously a councillor between 2003-05, said: “I’m delighted and want to give thanks to the people of Falsgrave and everyone for the help and support they have given me.”