Complete & Unbelievable: The Otis Redding Dictionary of Soul, or simply Dictionary of Soul, is the fifth studio album by American soul singer-songwriter Otis Redding and his last solo studio album released before his death. The successful Otis Blue and the following performance at Whisky a Go Go led to his rising fame across the United States. The first side of the album mainly contains cover versions, and the second songs mainly written by Redding.

The Otis Redding Dictionary of Soul was released in October 1966 on the Stax label and peaked at number 73 and at number 5 on the Billboard 200 and the R&B LP charts respectively. The album produced two singles, "Fa-Fa-Fa-Fa-Fa (Sad Song)" and "Try a Little Tenderness". In 2000 it was voted number 488 in Colin Larkin's All Time Top 1000 Albums. In 2012, the album was ranked number 254 on Rolling Stone magazine's list of The 500 Greatest Albums of All Time. An expanded version, which includes stereo and mono mixes of the original album as well as additional tracks, was released in 2016.