A nice one in the classic cologne style is Guerlain's Eau de Guerlain. Kind of smells like a dusty lemon.
"Eau de Guerlain is to citrus what the mandolin, with its doubled up strings, is to a guitar. It is as if, by some arcane miracle of perfumery, the ivory and green notes of citron and verbena have been made to sing in harmony with the jaunty lemon-bergamot tune exactly a major third on either side, giving the whole thing a ravishing, nostalgic timbre. Even more miraculous, Eau de Guerlain has a coherent, fresh drydown that completely transcends the cologne genre. If you want citrus, there is simply nothing better out there." -Luca Turin
Monsieur Balmain - was recommended to me by a guy with over 1000 frags
Annick Goutal Eau d'Hadrien - smells like natural lemon
Chanel Allure Homme Edition Blanche - lemon meringue pie
Eau Sauvage - classic lemon and floral
Blenheim Bouquet - lemon and pine
“Acqua Di Parma Colonia or Essenza”
These are fantastic but I would say they are more neroli and floral than just lemon.
They are crazy good.