An unusual or unexpected position, or a viewpoint held by very few others in contrast to the majority viewpoint (especially in the phrases out in left field and way out in left field)
An unexpected, bizarre, or unwatched source (especially in the phrases out of left field and from left field).
The part of a baseball field which is beyond the infield and to the left of a person standing on home plate and facing the pitcher.
The defensive position in the outfield to the left.
The direction which is to the left from an object's perspective, the direction 90 degrees counter-clockwise from the front.