"Don't Say No to Tomorrow" is a song by New Zealand singer and songwriter Sharon O'Neill.

The song was released in June 1979 and became O'Neill's first top 10, peaking at number 6 in New Zealand.

O'Neill signed with CBS Records in 1978 and had released her debut studio album, This Heart This Song in February 1979.

John McCready, the head of CBS Records in New Zealand, was aware of the upcoming TVNZ telethon and convinced the producers to have O'Nell do the official song.

It was International Year of the Child and the theme of Telethon would be “Don’t Say No To Tomorrow”.