Longman Dictionary of Contemporary English
ballot paper
noun
EXAMPLES FROM CORPUS
▪ Also on the ballot paper was the one candidate, Lucy Courtney, for the post of senior vice-president.
▪ As in Ireland some voters would find the ballot paper confusing.
▪ Voters also heavily endorsed a clause on the ballot paper calling for the convening of a constituent assembly to reform the Constitution.
Wiktionary
ballot paper
n. a voting form, the paper upon which a vote is cast during a ballot