Yes, ostrich egg is halal.
Ostriches are generally considered halal birds, and therefore their eggs are also considered halal for consumption by Muslims. The permissibility of ostrich meat and eggs stems from their resemblance in appearance, habit, and lifestyle to other halal poultry. While specific rulings can vary among different Islamic scholars and schools of thought, the prevailing view considers ostrich eggs to be permissible. This aligns with the broader understanding that poultry similar to chickens, ducks, and turkeys are considered halal. Therefore, ostrich eggs fall under this category.