The current work aims to study the biodiversity of marine fouling organisms in Marina El-Alamein Resort, to discover the newly recorded Polychaeta species. In February, April, July, September, and November 2017, samples of marine fouling were collected from the area of study. A total of 61 fouling taxa were identified in the samples. Polychaeta was the most diverse group, represented by fifteen species, constituting 25% of the total number of recorded taxa. Three of them were first recorded in the Egyptian Mediterranean Sea, including one sedentarian species (Protoaricia oerstedii) and two errantian species (Myrianida brachycephala and Syllis jorgei). These species extend through the Atlantic Ocean and the Mediterranean Sea, but the distribution of P. oerstedii in the Red Sea may indicate its anti-Lessepsian behavior. A concise re-description provided with illustrative photos, remarks, and distribution of these species are given.