In a bowl, whisk together 1/2 cup orange juice, 1/4 cup honey, and the 1-oz packet of Italian dressing mix until combined.
Place the chicken breasts in a shallow dish or resealable bag and pour the marinade over them, turning to coat evenly.
Refrigerate the chicken in the marinade for 1 hour.
Preheat the grill or grill pan to medium-high heat and lightly oil the grates.
Remove chicken from the marinade and place on the hot grill; cook 6 to 8 minutes per side (total 12 to 15 minutes), turning once, until an instant-read thermometer inserted into the thickest part reads 165°F (74°C).
Transfer the chicken to a plate and let rest a few minutes before serving.