No published record has yet been made, apparently, of the algal flora of Steuben county, Indiana. The many lakes and bogs, together with several streams which are in the county, make the area an excellent one for collecting algae. The writer visited the county in May, 1929, July and September, 1933, and obtained specimens particularly from the following lakes: Bass, Crooked, Failing, Fox, Hogback, James, Nevada Mills and Snow. Approximately fifty algae have so far been identified from the collections. Those that have not previously been reported for Indiana are printed in boldface type. It is hoped that additional lists of the algae of Steuben county may be published from time to time. No desmids or diatoms are included in this first paper.