Pastor Leopold v. Otto also Leopold Marcin von Otto (2 November 1819 in Warsaw – 22 September 1882 in Warsaw) was a Lutheran pastor of the German community in Warsaw and Poland and a national activist, participant of the patriotic manifestation of 1861 in Warsaw.

He published a book about the "Deutsche Evangelische Gemeinde" (German Protestant Community Zwiastun Ewangeliczny) and also wrote sermons and religious writings.

In theology, he was a supporter of Lutheran orthodoxy and starkly rejected liberal theology and rationalistic interpretation of the Bible.

His second wife was Emilia Izabela Linde (1826–1857), daughter of Samuel Linde, Polish linguist.

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