Lexington class could refer to two classes of ships of the U.S. Navy:
* - a class of six battlecruisers designed during World War I, they were being constructed when the
Washington Naval Treaty
The Washington Naval Treaty, also known as the Five-Power Treaty, was a treaty signed during 1922 among the major Allies of World War I, which agreed to prevent an arms race by limiting naval construction. It was negotiated at the Washington ...
forced the cancellation of the class. The two that were the most advanced in their construction became aircraft carriers, (''see below'') while the other four were scrapped.
* - the conversion of two of the battlecruisers to
aircraft carriers. These ships, and , served in the U.S. Navy until ''Lexington'' was sunk during the Battle of the Coral Sea and ''Saratoga'' was used as a target ship for the Bikini atomic experiments (Operation Crossroads).
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