Rio Louro Airstrip (ICAO: SD3Y) is a small private aerodrome located in the municipality of Macaé, in the state of Rio de Janeiro, Brazil. It serves general aviation operations in the region and is not open to scheduled commercial passenger service. Macaé is widely known as the offshore oil capital of Brazil, being a major hub for Petrobras and the Brazilian petroleum industry. The airstrip likely supports executive, charter, and utility aviation linked to the oil and gas sector operating in and around the city. As a private facility with no IATA code, Rio Louro Airstrip has limited publicly available operational data. Travelers requiring commercial air service to Macaé would typically use Macaé Airport (MEA/SBME), the main public airport serving the city.