Terrence William "Blondie" Chaplin (born 7 July 1951) is a South African singer and guitarist from Durban, where he played in the band the Flames in the mid to late 1960s. From 1972 to 1973, he was a member of the Beach Boys and contributed to their albums Carl and the Passions – "So Tough" (1972) and Holland (1973). During his stint with the Beach Boys, he sang the lead on the popular song, "Sail On Sailor". Chaplin was a long-term backing vocalist, percussionist, and acoustic rhythm guitarist for the Rolling Stones on their recordings and tours over a 15-year period, starting in 1997. Chaplin has released two solo albums, Blondie Chaplin (1977) and Between Us (2006).

Chaplin grew up in South Africa and is of mixed racial descent.

Both Chaplin and drummer Ricky Fataar were members of Durban-based rock band the Flames, which they joined at ages 13 and 9, respectively. Their 1968 album Soulfire produced a hit in South Africa: the band's cover of "For Your Precious Love" was No. 1 on white radio for thirteen weeks.

Beach Boy Carl Wilson heard the Flames while the band was performing in London. Wilson signed them to the Beach Boys' Brother Records label and produced their album The Flame (changed from Flames, to avoid confusion with the Famous Flames who were backup singers with James Brown), which featured soulful rock-pop songs in the vein of the Beach Boys and Badfinger. The Flames were the only band aside from the Beach Boys to record for Brother Records.

Chaplin, along with Fataar, joined the Beach Boys when original drummer Dennis Wilson suffered a hand injury that left him unable to play the drums for almost two years.

For the Beach Boys, it was a period in which long-time member Bruce Johnston had departed the band, and one-time leader Brian Wilson's participation in the group was very limited. As a result, Chaplin and Fataar joined the Beach Boys as full-fledged members and not merely as backing musicians. Chaplin sang lead on various Beach Boys songs from two studio albums, Carl and the Passions – "So Tough" and Holland, and plays on the live album The Beach Boys in Concert. "Sail On, Sailor" from Holland, on which he is the lead singer, is his "signature song". Chaplin left the group in 1973 after a dispute with the Beach Boys' management; Fataar left the band the following year.

Chaplin toured with former Rolling Stones guitarist Mick Taylor and performed on his live album Stranger in This Town. Starting in 1997, with the recording and release of the Bridges to Babylon album and subsequent tour, and, for some 15 years following, Chaplin served as a backing vocalist, percussionist, and, at times, backing guitar player for the Rolling Stones, in the recording studio and on the road. The Bridges to Babylon album lists Chaplin's credits as backing vocals, tambourine, piano, bass guitar, percussion, shakers, and maracas.

In late 2013, Chaplin was featured at select shows of former Beach Boys bandmate Brian Wilson, who toured along with former Beach Boys members Al Jardine and David Marks and guitarist Jeff Beck. Chaplin also appears on Wilson's 2015 album No Pier Pressure, on which he is the featured vocalist on the song "Sail Away", and he then went on tour as a featured performer, along with Jardine, for Brian Wilson's 2015 tour, with Rodriguez as the opening act.