Is there a manga where the main characters are assassins who follows a strict code of honor?

For the genres, it can be both shounen and seinen, as well as fantasy or science fiction.

Hope this helps out, and thanks.

See ya!

Lone Wolf and Cub
Is probably right down your alley.

Samurai Executioner
Is not really an assassin manga but he follows the Bushido code like no one else.

I think Code:Breaker fits, maybe Akumetsu too.

This week's favorites:

• Golden Kamui

ççççççç[Ô.Ô] tsutopodus© will eat your manga and steal your cats!

Jackals might be to your liking. So far, it's pretty bad ass.

Luck Stealer is a good one he's a assassin to help his daughter. Only has 4 chapter though

Ordinary+-