In a large pot of boiling salted water, cook pasta according to package instructions. Drain and transfer to a large bowl.
Heat a large skillet over medium-high heat. Add ground beef, breaking up meat with a wooden spoon. Season with taco seasoning, salt, and pepper, and cook until meat is no longer pink, about 6 minutes. Drain excess fat.
Make dressing: In a small bowl (or liquid measuring cup) whisk together olive oil, lime juice, and cumin. Season with salt and pepper. Pour over pasta and toss to combine.
