Mammillaria baumii

{{Short description|Species of cactus}}

{{Speciesbox

|image = Mammillaria baumii.jpg

|status = LC

|status_system = IUCN3.1

|status_ref = {{cite iucn |author=Fitz Maurice, B. |author2=Fitz Maurice, W.A. |author3=Hernández, H.M. |author4=Sotomayor, M. |author5=Smith, M. |date=2017 |title=Mammillaria baumii |volume=2017 |page=e.T152395A121533768 |doi=10.2305/IUCN.UK.2017-3.RLTS.T152395A121533768.en |access-date=12 November 2021}}

|genus = Mammillaria

|species = baumii

|authority = (Boedeker, 1926)

}}

Mammillaria baumii is a species of cactus in the subfamily Cactoideae.{{cite web |url= http://www.catalogueoflife.org/annual-checklist/2014/details/species/id/13438501|title= Species 2000 & ITIS Catalogue of Life: 2014 Annual Checklist.|author= Roskov Y.|author2= Kunze T.|author3= Orrell T.|author4= Abucay L.|author5= Paglinawan L.|author6= Culham A.|author7= Bailly N.|author8= Kirk P.|author9= Bourgoin T.|author10= Baillargeon G.|author11= Decock W.|author12= De Wever A.|editor= Didžiulis V.|year= 2014|publisher= Species 2000: Reading, UK.|access-date= 7 September 2015}} It is endemic to Mexico. It was named for botanist Hugo Baum.