This study was conducted on 28 completely edentulous patients to compare between implant-supported magnet retained mandibular overdentures versus implant-supported ball and socket retained mandibular overdentures in terms of retention and patients satisfaction. At the beginning, conventional complete dentures were constructed for all the patients. A CBCT was performed before implant surgical procedure with the aid of radiographic stent. Two implants were placed in a conventional manner interforaminally at the canine area bilaterally. After suture removal the implants were left for two months to allow for osseointegration and throughout the healing period the patients were instructed to wear their conventional dentures after adjustment and application of soft liner. After the osseointegration period, the prosthetic phase was initiated. Then the patients were randomized to be divided into two groups identical in number, 14 patients in each group. The first group: received ball and socket attachments, the second group: received magnet attachments. Retention was measured for each group (baseline, 1month, 3months and 6 months) by using a digital force-meter where pulling force was applied gradually until the denture was dislodged. The retentive force was measured for the initial separation of the mandibular overdenture. Patients' satisfaction was assessed using Oral Health Impact Profile Questionnaire (OHIP 14). The assessment was made at baseline (1 week) after denture insertion and six months follow-up period. Ball and socket group showed higher retention values than magnet group, with no statistically significant difference between mean retention loss values in the two groups. Patient’s satisfaction was high in both groups with statistically significant decrease in mean OHIP-14 scores after 6 months in each group.