Sentry: Golden Guardian

Paul Jenkins, Jae Lee and John Romita Jr.
with Brian Michael Bendis, Steve McNiven and Tom Raney

Sentry #1
Sentry #2
Sentry #3
Sentry #4
Sentry #5

Sentry/Fantastic Four #1
Sentry/Hulk #1
Sentry/Spider-Man #1
Sentry/X-Men #1
Sentry Vs. the Void #1

NOTE: A few years after Sentry's initial series, he became a featured character in Brian Michael Bendis' various Avengers series (New, followed by Mighty and then finally Dark). I won't be covering every single appearance on this post, but I'll link to those Avengers series below alongside a few key appearances and related issues with some other Sentry-specific issues.

Avengers: New Avengers

New Avengers #7
New Avengers #8
New Avengers #9
New Avengers #10

Sentry #1
Sentry #2
Sentry #3
Sentry #4
Sentry #5
Sentry #6
Sentry #7
Sentry #8

New Avengers #24
Civil War: The Return #1

Avengers: Mighty Avengers

Mighty Avengers #14

Avengers: Dark Avengers
See: Siege

Sentry: Fallen Sun #1