Alessandro "Sandro" Pignatti (born 28 September 1930) is an Italian botanist specialising in pteridophytes and spermatophytes. The Australian plant species, Calectasia pignattiana was named after him. On 31 May 1991 Pignatti received an honorary doctorate from the Faculty of Mathematics and Science at Uppsala University, Sweden  He is a Honorary Member of the International Association for Vegetation Science (1997).
"The specific epithet honours Professors Erika and Alessandro Pignatti of Rome on the occasion of their seventieth birthdays. They have contributed greatly to our knowledge of south-west vegetation associations and have collected extensively, including many taxa new to science."
- "Author Details". The International Plant Name Index. Retrieved 14 December 2011.
- Barrett, Russell L.; Dixon, Kingsley W. (8 January 2001). "A revision of the genus Calectasia (Calectasiaceae) with eight new species described from south-west Western Australia" (PDF). Nuytsia. 13 (3): 446. Retrieved 18 February 2015.
- IPNI. Pignatti.
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