"Think" is a song written by Peggy Whittington and performed by Brenda Lee. The song reached #4 on the adult contemporary chart, #25 on the Billboard Hot 100, and #26 on the UK in 1964. It also reached #62 in Australia. The song is featured on her 1965 album, Too Many Rivers.
The single's B-side, "The Waiting Game", reached #62 in Australia and #101 on the Billboard chart.