The 1977 Italian Open was a combined men's and women's tennis tournament that was played by men on outdoor clay courts at the Foro Italico in Rome, Italy.

The men's tournament was part of the Colgate-Palmolive Grand Prix circuit while the women's tournament was part of the Colgate Series.

The singles titles were won by eight-seeded Vitas Gerulaitis and fifth-seeded Janet Newberry who earned $21,000 and $6,000 first-prize money respectively.

Gerulaitis competed despite being contracted to play for the Indiana Loves World Team Tennis (WTT) franchise and was fined $19,000 for failing to play Björn Borg in the weekend of the final.

[3][4][5] Vitas Gerulaitis defeated Antonio Zugarelli 6–2, 7–6(7–2), 3–6, 7–6(7–5) Janet Newberry defeated Renáta Tomanová 6–3, 7–6(7–5) Brian Gottfried / Raúl Ramírez defeated Fred McNair / Sherwood Stewart 6–7, 7–6, 7–5 Brigitte Cuypers / Marise Kruger defeated Bunny Bruning / Sharon Walsh 3–6, 7–5, 6–2