Len Deighton: Bernard Samson Novels

Main character: Bernard Samson, a British intelligence officer working for the Secret Intelligence Service (SIS).
Setting: England, Europe, Latin America
The novels were issued as three sets of trilogies, plus one "prequel."
Bold type indicates a book I've read.

Berlin Game (1983)
Mexico Set (1984)
London Match (1985)

Winter (1987)

Spy Hook (1988)
Spy Line (1989)
Spy Sinker (1990)

Faith (1994)
Hope (1995)
Charity (1996)

Len Deighton: The "Unnamed Hero" Series

Main Character: An anonymous secret agent (named "Harry Palmer" in the film adaptations)
Setting: England, Europe and USA
Bold type indicates a book I've read.

The IPCRESS File (1962)
Horse Under Water (1963)
Funeral in Berlin (1964)
Billion Dollar Brain (1966)
An Expensive Place to Die (1967)
Spy Story (1972)
Yesterday's Spy (1975)
Twinkle, Twinkle, Little Spy (1976), aka: Catch a Falling Spy