March 1, 1966: Venera 3 becomes first Earth object to land on Venus
March 17, 1966: Studebaker production stops forever
March 16, 1966: Gemini 8 accomplishes first docking in orbit
Gemini 8's Armstrong and Scott
The following events occurred in March 1966:
March 3, 1966 (Thursday)
- A violent F5 tornado struck without warning at 4:33 p.m. and devastated the Candlestick Park Shopping Center in Jackson, Mississippi, killing 13 people. The storms wrought catastrophic damage in Mississippi and Alabama along a 202.5 mi (325.9 km) track. Overall, 62 people (all but one in Mississippi) were killed in the storm and hundreds injured 
- The Zond 3 space probe to Mars, launched on July 18, 1965, from the Soviet Union, stopped transmitting at a range of 153,000,000 kilometers, in the third failure of a Soviet interplanetary probe in less than a month.
- Born: Tone Lōc (stage name for Anthony Terrell Smith), American hip hop artist and voice actor, in Los Angeles
William "Fred Mertz" Frawley
Alice "Gladys Kravitz" Pearce
- William Frawley, 79, American actor best known for portraying "Fred Mertz" on I Love Lucy, suffered a fatal heart attack as he was walking back from a movie to his apartment at the Knickerbocker Hotel in Hollywood.
- Alice Pearce, 47, Emmy-winning American television actress for her portrayal of the character "Gladys Kravitz" on Bewitched, died of ovarian cancer that she had been battling since the series had started
- Joseph Fields, 71, American playwright and film producer
March 26, 1966 (Saturday)
- Protesters in dozens of American cities demonstrated against the Vietnam War. In New York 20,000 marched down New York City's Fifth Avenue after a rally in Central Park, while a crowd of 2,000 paraded down State Street in Chicago. In Boston, about 2,000 protested peacefully until someone in the crowd began throwing eggs at the police and, as MIT Professor Noam Chomsky would later recall, "they cleared everybody away in about three seconds". Marches also took place in Washington, San Francisco, Denver, Atlanta, Oklahoma City, and Hartford.
Ozzie and Harriet and family
- Four spectators at the 12 Hours of Sebring race in Sebring, Florida, were killed, and four others injured, when a Ferrari car driven by Mario Andretti struck a Porsche driven by Don Wester, sending Wester's car through a fence and into the stands. A man and his two sons were dead at the scene, and a woman died of her injuries at a hospital. Earlier in the race, Canadian Driving Champion Bob McLean, was killed in a fiery crash when he lost control in a hairpin turn and struck a utility pole.
- After 14 seasons, the ABC television series The Adventures of Ozzie and Harriet, the network's third-oldest prime time show, telecast its last original episode. The network brought an end of many of its evening programs that would be considered classics in later years, including Ben Casey, McHale's Navy, The Donna Reed Show, The Addams Family, The Patty Duke Show and Gidget. Starring the family of bandleader Ozzie Nelson, his wife, and their sons David and Ricky, portraying themselves, the TV series had started as a radio show on October 8, 1944.