To secure the lowest mortgage interest rate, focus on several key factors. Maintaining a strong credit score can enhance your chances of approval and favorable terms. Consider the type of loan, as different options like conventional, FHA, USDA, and VA loans have varying rates and eligibility requirements. The loan term also impacts your interest rate and monthly payments. Additionally, a larger down payment can lead to lower rates, as it reduces lender risk. Collaborate with professionals for tailored advice throughout the home-buying process.