I have already researched "If We Must Die" by Claude McKay; I am looking for other well-known pieces of poetry that focus so strongly on the idea of honor.
Dulce et Decorum Est, by Wilfred Owen, mocks the conventional concept of military honor, suggesting through graphic imagery that death in the trenches is hardly honorable, and that the people who say that to die for one's country is an honorable death wouldn't be saying that if they actually had to risk their lives in war.
In "O Captain! My Captain," Walt Whitman addresses the honor and leadership of Abraham Lincoln. The poem's romantic language and great use of imagery and metaphor pay homage to this respected leader. Major themes: love, leadership, honor.
I would suggest Rudyard Kipling's "If" as an example of one person's ideas regarding the ways in which one should conduct oneself in order to live one's life with honor.