While star cameras and wide angle cameras in space are built from glass lenses, large aperture optical systems generally use reflective optics. For some large ones see answers to What's the largest aperture telescope sent beyond the Earth-Moon system?.
Discussion in comments below the question Why does LRO's laser altimeter telescopes use lenses instead of mirrors? where what looks like a pretty big lens has got me wondering.
Question: What's the largest optical lens put in space?
Optical could include infrared, visible and ultraviolet, but not microwaves. It could be an objective lens or a part of a larger optical assembly of mixed elements, or it could still be in its shipping crate.