10 Best Secret Islands in the Mediterranean for a Luxurious Escape

The Mediterranean is home to some of the world’s most exclusive and undiscovered island retreats—places where luxury meets seclusion and nature remains unspoiled. While destinations like Santorini and Capri steal the spotlight, a handful of secret islands in the Mediterranean offer a far more intimate and refined experience. From private hideaways with boutique resorts to uninhabited islands with crystal clear waters, these hidden gems are perfect for those seeking tranquility away from the crowds.

Here are 10 of the best secret islands in the Mediterranean for a truly luxurious escape.

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1. Kastellorizo, Greece

A Secluded Greek Island with Timeless Charm

Tucked away near the Turkish coast, Kastellorizo is a tiny, colorful island that feels like a step back in time. Its pastel-colored neoclassical mansions, azure blue waters, and relaxed atmosphere make it a perfect hideaway. With only a handful of boutique accommodations, it’s ideal for those seeking solitude with a touch of authentic Greek luxury.

Don’t Miss: A private boat trip to the Blue Grotto, a mesmerizing sea cave where the water glows an electric blue.

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2. Cavallo, France

The Private Island Playground of the Elite

Located between Corsica and Sardinia, Cavallo is a privately owned island with an air of exclusivity. Accessible only by private boat, it’s home to luxurious villas and a single hotel, Hôtel & Spa des Pêcheurs, which offers an elegant retreat. With no cars and pristine beaches, this is the ultimate sanctuary for those looking to disconnect in style.

Don’t Miss: Charter a yacht to explore the Lavezzi Archipelago, a collection of surreal granite islets surrounded by turquoise water.

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3. Kythira, Greece

A Mythical Retreat with Untouched Beauty

Often overlooked in favor of its Cycladic neighbors, Kythira is a hidden paradise with waterfalls, Venetian castles, and unspoiled beaches. Its laid-back atmosphere, combined with charming boutique hotels and family-run tavernas, makes it one of the most authentic secret islands in the Mediterranean.

Don’t Miss: A swim in the Fairy Pools of Fonissa, a series of natural rock pools hidden in lush greenery.

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4. San Pietro, Italy

A Remote Island with Italian Soul

Off the southwestern coast of Sardinia, San Pietro is an Italian gem known for its pristine waters, slow-paced lifestyle, and exceptional seafood. With only one town, Carloforte, this island offers secluded beaches and a charming harbor filled with elegant seaside trattorias.

Don’t Miss: The Girotonno Festival, an annual bluefin tuna festival celebrating the island’s centuries-old fishing heritage.

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5. Lastovo, Croatia

A Croatian Island Where Nature Reigns

Designated a nature park, Lastovo is one of Croatia’s most untouched islands. It’s known for its lush forests, medieval architecture, and complete lack of large resorts, making it one of the most undisturbed secret islands in the Mediterranean. If you crave a luxury experience in nature, boutique guesthouses and private villa rentals are your best bet.

Don’t Miss: A stargazing night—Lastovo is one of the best places in Europe for viewing the Milky Way due to minimal light pollution.

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6. Alonissos, Greece

A Marine Sanctuary with Eco-Luxury

Part of the Sporades Islands, Alonissos is home to one of the largest marine parks in Europe, making it a haven for diving and wildlife enthusiasts. The island’s slow tourism philosophy and sustainable luxury accommodations make it a dream destination for travelers looking to blend comfort with nature.

Don’t Miss: A private boat excursion to see monk seals and dolphins in their natural habitat.

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7. Pantelleria, Italy

The Black Pearl of the Mediterranean

Sitting between Sicily and Tunisia, Pantelleria is a volcanic island known for its therapeutic hot springs, rugged coastline, and unique dammuso villas—traditional stone houses that blend seamlessly into the landscape. Luxury in Pantelleria is raw and elemental, centered around privacy, nature, and wellness.

Don’t Miss: A mud bath at Lago di Venere, a crater lake with mineral-rich waters known for their skin-rejuvenating properties.

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8. Formentera, Spain

Ibiza’s Tranquil, Luxurious Sister

Formentera is the quiet, sophisticated counterpart to Ibiza, offering powdery white-sand beaches and crystalline waters. Unlike its party-loving neighbor, Formentera attracts those who prefer barefoot luxury, boutique hotels, and yacht hopping between hidden coves.

Don’t Miss: A sunset cocktail at Beso Beach, a chic beachfront restaurant where the Mediterranean vibe is at its finest.

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9. Tilos, Greece

The Ultimate Slow-Living Island

With just a few hundred residents, Tilos is a Greek island where life moves at a slower pace. It has no large resorts, only boutique eco-hotels and private villas nestled between secluded beaches and dramatic cliffs. Tilos is perfect for those looking for privacy, relaxation, and unspoiled landscapes.

Don’t Miss: A day at Eristos Beach, a secluded stretch of golden sand where time seems to stand still.

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10. Galesnjak, Croatia

The Island of Love—Exclusively Yours

Perhaps the most exclusive of all, Galesnjak—often called the "Lover’s Island" due to its heart-shaped form—is privately owned and available for exclusive rental. This tiny, uninhabited islet in the Adriatic Sea offers total seclusion, making it one of the most unique secret islands in the Mediterranean.

Don’t Miss: The chance to rent the entire island for a private retreat, complete with a chef, yacht, and personalized experiences.

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Final Thoughts

For those in search of hidden luxury, unspoiled landscapes, and ultimate privacy, these 10 secret islands in the Mediterranean provide an intimate escape far from the usual tourist routes. Whether it’s a private island rental, a boutique eco-hotel, or a historic villa by the sea, each of these destinations promises a unique blend of exclusivity and natural beauty.