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Venus or Mercury, depending in the type of "day" that you mean.

A "day" on Venus is -243.0185 Earth days long. The "minus" means it rotates in a direction opposite the Earth and all the other planets (except Uranus).

This "day " is the rotation period, called the "sidereal day".

However there's also the "solar day". That's roughly "sunrise to sunrise".

The solar day depends on a planet's orbital motion, as well as its rotation.

Venus has a solar day of about 116.5 Earth days.

For the solar day it's Mercury that has the longest day, because of

the direction of rotation of Venus. Mercury has a solar day of about 176 Earth days.

Comment: The "related link" given below isn't really related. It about the movie

called "The Longest Day".

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12y ago

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