- ATCC Protistology Collection
 - General service collection of protozoa and algae.  British Section of the Society of Protozoology (BSSP)
- Provides meeting programmes and abstracts from both their invited and contributed papers.- Culture Collection of Algae and Protozoa (CCAP)
- Holds strains of algae and protozoa that are supplied worldwide to industry and the academic community.
- Diversity in Kingdom Protista: An Interactive Phylogenetic Tree
- Guide to the simplest eukaryotes.
- Droplet: Amateur Microscopy of the Protozoa
- Capturing images of the fascinating and immensely diverse group of single cellular organisms.
- Euglenoid Project, The
- Resource for students, teachers, and researchers interested in the group of protists commonly known as the euglenoids.
- Glasgow University Zoology Museum: Protozoa
- Offers an introduction to the single-celled eukaryotic organsims that feed heterotrophically and exhibit diverse motility mechanisms.
- International Society for Evolutionary Protistology (ISEP)
- Providing news, information, and resources for members and all persons interested in the phylogeny and evolutionary biology of protists (algae, fungi, and protozoa.)
- Parasitology: Protozoa
- Lists the parasitic phyla that infect vertebrates and invertebrates and those that are even parasitic in plants.
- Pond Life Identification Kit: Protozoa
- Provides an overview of some of the major freshwater groups of the microorganisms.
- Protist Image Data
- Provides pictures and information on selected genera of algae and protozoa.
- Protist Information Server
- Searchable database providing images of protists and movie clips as research and educational resources.
- Protozoological Abstracts
- Online bibliographic and abstracts database of internationally published research on parasitic protozoa.
- Protsville: Protist Research Laboratory - University of Sydney
- Home to protozoan and protistan diversity, biogeography, bioinformatics, and evolution information.
- Society of Protozoologists (2)
- White Laboratory - Montana State University
- Research focuses on the Apicomplexan protozoans such as Toxoplasma and Cryptosporidium.
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