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In vector calculus, a Beltrami vector field, named after Eugenio Beltrami, is a vector field in three dimensions that is parallel to its own curl. That is, F is a Beltrami vector field provided that

Thus and are parallel vectors in other words, .

If is solenoidal - that is, if such as for an incompressible fluid or a magnetic field, the identity becomes and this leads to

and if we further assume that is a constant, we arrive at the simple form

Beltrami vector fields with nonzero curl correspond to Euclidean contact forms in three dimensions.

The vector field

is a multiple of the standard contact structure −zi + j, and furnishes an example of a Beltrami vector field.

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