Assigning molecules as homoaromatic has been a long-standing problem since molecules with sufficient stability and lifetime were elusive. We herein describe the synthesis of homoannulene ester 15 and the related acid 16, the first isolated neutral homoaromatic hydrocarbons. Their homoaromatic state was evidenced by 1 H NMR spectroscopic data indicating a significant ring current in addition to a high degree of bond length equalization in the X-ray crystal structures. A detailed computational analysis by means of NICS scans and ACID isosurface plots revealed the ring currents and conjugation pathways. The local 6 homoaromatic state of homoannulene ester 15 can be photoswitched at 300 nm to a purely global 10 homoaromatic state by an unprecedented photochemical [1,11]