Greece has a lot of various island complexes that have big differences from one another. The Dodecanese, Cyclades, the Northeastern Aegean Islands, the Sporades, the Argo-Saronic Islands and the Ionian Islands are few of the island complexes that are found in Greece. The islands of Crete and Evia may also be added to the list of island complexes that Greece has.

The Cyclades Island Complex is a complex comprising of 220 islands. Only around forty of these islands are being inhabited. The Cyclades are located in the middle of the Aegean Sea, which makes it accessible for people coming from Athens. The names of these complexes came from the Greek word "kiklos" that means circle, as this island takes a circular form. Mykonos and Santorini are two of the most visited Greek islands that belong to Cyclades. The famous panorama of cubed-shaped, white-washed houses having blue windows is primarily found in the Greek islands of Cyclades Island Complex.

The Dodecanese Island Complex got its name from the Greek word "dodeka" which means twelve. This is so because the major islands of this complex are twelve. In totality, the number of islands in this complex counts one-hundred fifty having most of these uninhabited. This Dodecanese Island Complex is found nearby Turkey because the islands are found in the southeastern part of the Aegean Sea. The trips through ferries to these islands are infrequent and may take a longer time. The islands, nevertheless, can be reached by plane. Rhodes and Kos islands are the two main and most famous islands of this complex.

The Argo-Saronic Island Complex is a small island complex found near Athens and Piraeus. This complex has only seven inhabited islands and was named after the Saronic and Argolic Gulfs. From Athens, one can reach the island of Salamina in less than ten minutes by ferry. The island of Spetses can be found at the south of this island complex.

The Sporades is a small island complex located at the northern part of the Aegean Sea. Only four of the twenty-four islands of the complex are inhabited namely Skiathos, Skopelos, Alonissos, and Skyros. These four islands are popular for having their natural beauty and green forests.

There is another island complex in the Ionian Sea which is known as Eptanisa in Greek. This word means seven islands, evidencing the seven main islands of the complex. Ionian Islands are covered by green forests that lie at the end of beaches and waters.