Ahnfeltia concinna
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ahnfeltiales
- family: Ahnfeltiaceae
- genus: Ahnfeltia
- species: Ahnfeltia concinna
Shimoda
Shizuoka
Japan
Monterey
Pacific Grove
San Francisco
California
Friday Harbor
Washington
United States