Fleet Week is a United States Navy, United States Marine Corps, and United States Coast Guard tradition in which active military ships recently deployed in overseas operations dock in a variety of major cities for one week. Once the ships dock, the crews can enter the city and visit its tourist attractions. At certain hours, the public can take a guided tour of the ships. Often, Fleet Week is accompanied by military demonstrations and air shows such as those provided by the Blue Angels.

The first Fleet Week was celebrated in San Diego, California, during the 1935 California Pacific International Exposition. The years between World War I and World War II saw an increasing military build-up in both Japan and Germany, while the communist Soviet Union (USSR) was given over to the wave of Stalinist nationalism. Most United States citizens experienced little sense of urgency about foreign developments because of isolationism and concerns with the ongoing economic Great Depression. However, then-U.S. President Franklin D. Roosevelt, a former Assistant Secretary of the Navy, was intent on expanding the U.S. Navy in response to world political trends. A major aircraft company was moving to Lindbergh Field, (today more commonly known as San Diego International Airport). In this atmosphere, Fleet Week was born.

At 11 a.m. on May 29, 1935, a color guard of the U.S. Marine Corps led a parade across Cabrillo Bridge to Plaza del Pacifico, where the U.S. flag was raised to open the Exposition officially. At 8 p.m., Roosevelt spoke by telephone and designated two selected orphans to press the buttons turning on the lights which bathed the grounds in color. In his remarks, heard over the loudspeaker system, Roosevelt said: "The decision of the people of San Diego thus to dedicate the California Pacific International Exposition is, I believe, worthy of the courage and confidence with which our people now look to the future. No one can deny that we have passed through troubled years. No one can fail to feel the inspiration of your high purpose. I wish you great success."

During Fleet Week in June 1935, 114 warships and 400 military planes arrived under command of U.S. Navy Admiral Joseph M. Reeves, Commander-in-Chief of the U.S. Fleet. It was described as the mightiest fleet ever assembled under the U.S. flag. It included forty-eight battleships, cruisers and aircraft carriers, with more than 3,000 commissioned officers and 55,000 enlisted men. The U.S. Navy men visited the Exposition and, in turn, thousands of San Diegans and other fairgoers were guests on the various ships.

For years it was common for several U.S. Navy ships to dock in San Francisco, California for a similar series of events. One or more fleet ships were docked as a "visit ship" for tourists to board, and the local community took in sailors for home visits; drinks were often discounted to uniformed sailors at area bars and restaurants. The highlight of the San Francisco Fleet Week is the Air Show on San Francisco Bay with the Blue Angels as the center of attention. The Air Show also features stunt planes and parachute team and Coast Guard demonstrations. Another highlight of the Fleet Week SF is a parade of ships under the Golden Gate Bridge.

The revived name of Fleet Week was applied to an expanded and more heavily publicized fleet visit in 1981, in conjunction with Columbus Day Weekend celebrations during the second week of October. Since then, the event has been held each year during the Columbus Day Weekend without a break and celebrated its 25th anniversary in 2005. The event is estimated to attract over one million people who watch the air show along the San Francisco Bay waterfront stretching from the Ferry Building to the Golden Gate Bridge. The event was canceled for 2013 due to federal budgetary issues, but was revived in 2014, and continues to be an annual event.

Ships included:

Ships included: