A touch sensor and a display apparatus are disclosed. The touch sensor includes a first opening region, a second opening region, first touch electrodes and second touch electrodes. at least one of the plurality of first touch electrodes includes a first transition touch electrode; each of a first group of second touch electrodes in the plurality of second touch electrodes further includes a second transition touch electrode the first transition touch sub-electrode at least partially surrounds the first opening region, and the second transition touch sub-electrode at least partially surrounds the second opening region; and at least part of the second transition touch electrode is positioned between the first transition touch sub-electrode and the second transition touch sub-electrode, and extends along the second direction.