Which planet orbits nearest to earth?

It's hard to answer this question because it changes, depending on the positions of the planets in their orbits.

Venus can get closer to Earth than any other planet, but that doesn't mean it's always the closest. The orbit of Venus averages about 41 million kilometers (25.5 million miles) closer to the Sun than Earth. The orbit of Mars averages about 79 million kilometers (49 million miles) farther out than Earth.

At any given time, Venus or Mars (or very, very rarely, Mercury) might be the closest planet to Earth.