Hmmm... not sure if these are what you are looking for, but here is what comes to mind.

Dead Poet's Society (happens off camera, but definitely happens)

M*A*S*H (been too long since I have seen the movie... I know one of the characters strongly comtemplates suicide, and that is the subject of the theme song, but I don't remember if he went through with it)

Virgin Suicides (?) Haven't actually seen the movie, so I don't know for sure.

Titanic

Airplane and Airplane II

May think of others later.