Alimos (Greek: Άλιμος) is a suburb in the south-southwestern part of Athens, Greece, also known as Kalamaki (Καλαμάκι). Poseidonos Avenue runs in the western part of Alimos, with the Hymettus mountain to the east meeting mainly grassland, while areas to the north of Argyroupoli are forested. The nearest subway station is at Alexandros Panagoulis station and is also accessed by a tramway opened in 2004, serving as access with the Attiki Odos (number 63) to the east. Vouliagmeni is to the west, and the area lies South of Athens, Southeast of Piraeus, Northwest of Sounio, and almost directly north of the old Ellinikon International Airport, which served two entry points and several Olympic venues, including a basketball arena. The Saronic Gulf is located to its west.

Early in the 20th century the area consisted of farmland, primarily pastures and groves. In the 1940s and again in the 1970s, urban development and businesses replaced much of the farmland, so that today, much of the area is urbanized. Business is concentrated in the south and along main avenues. A large marina is situated to the west serving tens of piers with up to 1,100 boats. Depth ranges from 2 to 7 metres.