Johann Baptist Martinelli (February 8, 1701, Vienna - June 21, 1754, Vienna) was an Austrian architect and constructor of Italian descent.

He was the son of architect Franz Martinelli. In cooperation with his brother Anton Erhard Martinelli, he designed the plans of several baroque church in the Habsburg empire, among which the church in Grossweikersdorf and the Holy Trinity Cathedral in Blaj. He also designed several mansions among which the one in Dolná Krupá.

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