We report the discovery of a cluster-scale lensed quasar , SDSS J1029+2623 , selected from the Sloan Digital Sky Survey .
The lens system exhibits two lensed images of a quasar at { z _ { s } } = 2.197 .
The image separation of 22 \farcs 5 makes it the largest separation lensed quasar discovered to date .
The similarity of the optical spectra and the radio loudnesses of the two components support the lensing hypothesis .
Images of the field show a cluster of galaxies at { z _ { l } } \sim 0.55 that is responsible for the large image separation .
The lensed images and the cluster light center are not collinear , which implies that the lensing cluster has a complex structure .