Curtiss
- Family history of Jim and Fred Curtiss from Pinellas Park, Florida, USA.
- http://www.familytreemaker.com/users/c/u/r/Jim-Curtiss/

Curtis Correlation
- Researching the surnames Cutis and Grady. Compiled by Vicki L. (Curtis) Beachy and W. Irving Curtis of Oakhurst, CA USA.
- http://familytreemaker.genealogy.com/users/b/e/a/Vicki-L-Beachy/?Welcome=1007207199

Curtis
- Documenting the history of the name and its worldwide application. Includes Curtis, Curtiss, Curtice and associated variants.
- http://www.curtis-curtiss.com/

Curtis of Somerset
- Kentucky descendants of Thomas Curtis (1598-1681) from Wethersfield, Connecticut, USA.
- http://www.curtisit.com/curtis/