Church of the Holy Cross (Croatian: Crkva svetog Križa) is a Croatian Pre-Romanesque Catholic church originating from the 9th century in Nin.

According to a theory from an art historian Mladen Pejaković, the design has an intentionally unbalanced elliptical form designated to "follow" the position of the Sun, retaining the functionality of a calendar and sundial. In its beginning, in the time of the Croatian principality, it was used as a royal chapel of the duke's courtyard nearby.

The church is that of a central type, it features the Croatian interlace (or simply "troplet") and a carved name of the župan of Nin "Godečaj".

The church is known under the moniker of "the smallest cathedral in the world", however it currently is not seat of a bishop of Nin.

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  Back view
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  Right view
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  The entrance with an altar fence
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  Entrance plaque
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  Interior

• Nin, Croatia
• Church of St. Nicholas, Nin
• Architecture of Croatia
• Church of St. Donatus
• Church of Holy Salvation, Cetina

44°14′35″N 15°11′04″E / 44.24306°N 15.18444°E / 44.24306; 15.18444