Purpose: The aim of this in vitro study was to evaluate the stress analysis of the maxillary implant retained palatless overdenture with two and four equator versus locator attachments on V shaped palatal vault on maxillary model. Materials and Methods: Four standard educational transparent acrylic resin models were covered with materialsimulating mucosa. Two of these models were received two implants in canines' area, and the other two models received four implants in canine and second premolar areas. After overdenture was constructed, strain gauge was cemented to each surface of all implants (Buccal, palatal, mesial, distal). LLOYD Digital loading device was used to apply compressive loads from 0- 50 N to the center of bar extended between the first molars while the various attachments were connected to implant fixtures. Results: The highest stress was in equators on two implants (114.55×10²) N/M², followed by locators on two implants (44.63×10²) N/M², then equators on four implants (15.24×10²) N/M², and locators on four implants was showed the lowest stress (5.83×10²) N/M². Conclusions:The locator attachments showed less stress values than equator attachments when the implants number and distribution are standards. Also, the stresses on two implants were higher than stresses on four implants when the same attachments are applied.