The 1966 County Championship was the 67th officially organised running of the County Championship.^[1] Yorkshire won the Championship title.

The method of obtaining points for the first innings was changed with two points awarded for a first innings lead for any match won, lost or drawn.^[2]

Table

• 10 points for a win
• 5 points to each side for a tie
• 5 points to side still batting in a match in which scores finish level
• 2 points for first innings lead
• 1 point for first innings tie
• If no play possible on the first two days, and the match does not go into the second innings, the side leading on first innings scores 6 points. If the scores are level, the side batting second scores 3 points.
• Position determined by points gained. If equal, then decided on most wins.
• Each team plays 28 matches.
• The first innings in the first 102 matches of the season (first 12 games played by each county on a home and away basis) was restricted to 65 overs. Normal conditions applied to return matches or when sides met only once in the season.