This page shows public proxy servers with IP addresses detected in Greece. The list can be very short, so the best first step is to look at the newest check time rather than compare too many metrics.
If no Greece entry works for your setup, use the Europe proxy list to compare nearby European alternatives.
When a Greek proxy appears in the table, check the city and ISP to see where the IP is detected and which network it belongs to. If only one entry is online, do not spend too much time trying to optimize by speed. Test it first, then return later after the next update if it fails.
The protocol column is important on short lists. Copy the IP address and port, then set the same proxy type in your browser, proxy checker, app, or script. An HTTP entry should be added as HTTP, not as SOCKS.
For Greece, Last Checked and Uptime are more useful than a single speed value. A proxy can respond during one scan and disappear soon after, so treat the table as a live testing list, not a guaranteed pool.