os.Remove() function can be used to delete a file in Golang. Below is the signature of this function
func Remove(name string) error
Code:
package main
import (
    "log"
    "os"
)
func main() {
    err := os.Remove("sample.txt")
    if err != nil {
        log.Fatal(err)
    }
}
Output:
Deletes sample.txt file from the current working directory