Early Appearances:
* Brave and the Bold #30 (1960): Amazo's first appearance, created by Gardner Fox and Murphy Anderson.
* Brave and the Bold #32 (1961): Amazo's first defeat by the Justice League.
* Justice League of America #2 (1960): Amazo returns and faces the Justice League again.
Later Appearances:
* Justice League of America #143 (1977): Amazo returns and battles the Justice League once more.
* Justice League of America #144 (1977): Amazo is defeated again.
* Justice League of America #150 (1978): Amazo's powers are amplified and he becomes more powerful.
* Justice League of America #184-185 (1981): Amazo is used as a weapon by the Legion of Doom.
Modern Appearances:
* JLA #35-36 (1999): Amazo returns as a member of the Legion of Doom.
* Justice League of America Vol. 2 #1-6 (2006): Amazo's origin is explored and he battles the Justice League.
* Justice League of America #51-53 (2012): Amazo returns and battles the Justice League once again.
* Justice League: Throne of Atlantis (2015): Amazo is featured in this animated film.
* Justice League vs. Teen Titans (2016): Amazo appears in this animated film.
Other Notable Appearances:
* The Brave and the Bold #24 (1959): Amazo is mentioned in a flashback story.
* Justice League of America #179 (1980): Amazo's powers are upgraded by a scientist.
* Justice League of America #192 (1981): Amazo is used as a weapon by the Legion of Doom.
* Justice League of America Annual #14 (1987): Amazo is used as a weapon by the Legion of Doom.
* Justice League of America #54 (1978): Amazo is used as a weapon by the Legion of Doom.
* Justice League of America #164 (1979): Amazo is used as a weapon by the Legion of Doom.
* Justice League of America #171 (1980): Amazo is used as a weapon by the Legion of Doom.
* Justice League of America #178 (1980): Amazo is used as a weapon by the Legion of Doom.
This list is by no means exhaustive, but it covers many of Amazo's most notable appearances. You can find more information about his appearances on websites like Comic Vine, the DC Database, and the Grand Comics Database.