Horace Swaby (June 21, 1954 – May 18, 1999), better known as Augustus Pablo, was a Jamaican roots reggae and dub record producer, melodica player and keyboardist, active from the 1970s onwards. He popularized the use of the melodica (an instrument at that time primarily used to teach children music in the Jamaican public schools) in reggae music. He was a committed Rastafarian.

He was born in St. Andrew, Jamaica and learned to play the organ at the Kingston College School. It was at that point an unnamed girl lent him the melodica. Fascinated by the instrument, Pablo rarely put it down. He also met Herman Chin Loy, who after working at his cousin Leslie Kong's Beverley's record shop, had set up his own Aquarius store in Half Way Tree. Swaby recorded early tracks including "Higgi Higgi", "East of the River Nile", "Song of the East", and "The Red Sea" between 1971 and 1973 for Chin-Loy's Aquarius Records. Chin Loy had previously used the name Augustus Pablo generically for keyboard instrumentals recorded by Lloyd Charmers and Glen Adams, and Swaby took the name for this recording.

"East of the River Nile", a unique blend of East Asian and Jamaican sounds, became a moderate hit. He soon joined Now Generation (Mikey Chung's band) and played the keyboard with them while his friend Clive Chin began his own career as a record producer. Pablo and Chin recorded "Java" (1972) together, as soon as Pablo quit Now Generation and Clive was able to get the studio time. This instrumental was a massive hit and launched Pablo's solo career. He recorded with Chin and various others, including Leonard Chin, his uncle, and Lee Perry. He scored another smash hit with "My Desire" (John Holt).

Pablo formed the labels Hot Stuff, Message and Rockers (named after his brother's soundsystem, Rockers), and released a steady stream of well-received instrumentals, mostly versions of older hits from Studio One. In spite of his success with Rockers, Pablo's 1974 album, This Is Augustus Pablo was recorded with Clive and Pat Chin. This was followed by a collaboration with the legendary reggae engineer King Tubby, 1975's Ital Dub.

In the later 1970s, Pablo produced a steady stream of hits, including the hit "Black Star Liner" (Fred Locks). He also worked with Dillinger, Norris Reid, I-Roy, Jacob Miller, Te -Track, The Immortals, Paul Blackman, Earl Sixteen, Roman Stewart, Lacksley Castell, The Heptones, Bob Marley, Ricky Grant, Delroy Wilson, Junior Delgado, Horace Andy and Freddy McKay. This period was eventually commemorated with critically acclaimed LPs including King Tubby Meets Rockers Uptown (1976) and Hugh Mundell's classic Africa Must be Free by 1983. This was followed by East of the River Nile (1978), Original Rockers (1979) and Rockers Meets King Tubby in a Firehouse, another acclaimed hit album.

In the 1980s, Pablo's career slowed significantly. In 1980, he appeared on the soundtrack of the documentary D.O.A. He had begun to establish an American audience and released Rising Sun in 1986 to good reviews and sales. Pablo also produced memorable hits, including "Ragamuffin Year" (Junior Delgado), "Humble Yourself" (Asher & Tremble) and "Far Far Away" (Ricky Grant). In addition, he toured extensively throughout the world, making a memorable live album in Tokyo in 1987. That same year, Rockers Come East re-established his career and he began to release a series of critically acclaimed though somewhat inaccessible albums in the 1990s, including Blowing With the Wind and also producing several, such as "Night & Day" (single) (Dawn Penn) and "Jah Made Them All" (Yami Bolo).

Augustus Pablo died as a result of a collapsed lung on 18 May 1999. He had been suffering for some time from the nerve disorder Myasthenia gravis.