List of Famous people who died at 78

Richard Dennis Ralston was an American professional tennis player whose active career spanned the 1960s and 1970s.

Peter Edward Walker, Baron Walker of Worcester, was a British Conservative politician who served in Cabinet under Edward Heath and Margaret Thatcher. He was Member of Parliament (MP) for Worcester from 1961 to 1992 and was made a life peer in 1992.

Robert Arthur James Gascoyne-Cecil, 5th Marquess of Salisbury,, known as Viscount Cranborne from 1903 to 1947, was a British Conservative politician.

Jesper Langberg was a Danish film actor. He appeared in more than 50 films.

Clarence Sutherland Campbell, was the third president of the National Hockey League from 1946 to 1977. The NHL's Clarence S. Campbell Bowl is named for him.

Katherine Florence Dotrice, known professionally as Kay Newman and Kay Dotrice, was a British stage and screen actress, best known for her roles in the UK TV series Crossroads, the movie Cheech & Chong's The Corsican Brothers, and many repertory performances during the 1950s.

Philippe Lécrivain was a French Jesuit priest and historian.

Paulo César Saraceni was a Brazilian film director and screenwriter. He directed 14 films between 1960 and 2011. His 1999 film Traveller was entered into the 21st Moscow International Film Festival where it won a Special Mention.

Émile Gagnan was a French engineer and, in 1943, co-inventor with French Navy diver Jacques-Yves Cousteau of the Aqua-Lung, the diving regulator used for the first Scuba equipment. The demand-valve, or regulator, was designed for regulating gas in gas-generator engines, but was found to be excellent for regulating air-supply under varied pressure conditions. This allowed people to explore the ocean more easily, even though the original purpose was different.