- Source: Acanthosphinx
- Daftar spesies Sphingidae
- Acanthosphinx
- List of moths of Guinea-Bissau
- Smerinthini
- List of Sphingidae species
- List of moths of Zambia
- List of moths of the Central African Republic
- List of moths of the Democratic Republic of the Congo
- List of moths of Angola
- List of moths of Sierra Leone
- List of moths of Gabon
Acanthosphinx is a monotypic moth genus in the family Sphingidae erected by Per Olof Christopher Aurivillius in 1891. Its only species, Acanthosphinx guessfeldti, the widow sphinx, was first described by Hermann Dewitz in 1879. It is known from forests from Sierra Leone to the Congo, Angola, Zambia, Malawi, Tanzania and Uganda.
The length of each forewing is 57–70 mm.
The larvae feed on Bridelia micrantha.