P78 or P-78 may refer to: * P78, a Latvian State Regional Road * FB P-78, a variant of the FB P-64 pistol * XP-78, original designation of the North American XP-51B Mustang * P78-1, a solar physics satellite launched by the United States * HS Karathanasis (P 78), a Roussen-class fast attack craft in the Hellenic Navy * INS Kadmatt (P78), an Arnala-class corvette in the Indian Navy * RSS Sea Dragon (P78), a Sea Wolf-class missile gunboat in the Republic of Singapore Navy * HMS Voracious (P78), a V-class submarine in the Royal Navy This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.