1978 Wimbledon Championships – Mixed doubles

Bob Hewitt and Greer Stevens were the defending champions but did not compete.

Frew McMillan and Betty Stöve defeated Ray Ruffels and Billie Jean King in the final, 6–2, 6–2 to win the mixed doubles tennis title at the 1978 Wimbledon Championships.

Seeds
Frew McMillan / Betty Stöve (champions) 🇦🇺 Ray Ruffels / 🇺🇸 Billie Jean King (final) 🇦🇺 Geoff Masters / 🇬🇧 Virginia Wade (third round) 🇦🇺 Tony Roche / 🇫🇷 Françoise Dürr (semifinals) 🇺🇸 Marty Riessen / 🇦🇺 Wendy Turnbull (third round) 🇦🇺 Ross Case / 🇺🇸 Mona Guerrant (second round) 🇺🇸 Raz Reid / 🇦🇺 Kerry Reid (second round) 🇺🇸 Fred McNair / 🇦🇺 Lesley Hunt (third round)