Antialcidas Nikephoros (Ancient Greek: Ἀντιαλκίδας ὁ Νικηφόρος; epithet means "the Victorious", Brahmi: 𑀅𑀁𑀢𑀮𑀺𑀓𑀺𑀢𑀲 Aṃtalikitasa, in the Heliodorus Pillar) was a king of the Indo-Greek Kingdom, who reigned from his capital at Taxila.

Several later kings may have been related to Antialcidas: Heliokles II, Amyntas, Diomedes and Hermaeus all struck coins with similar features.

He issued a number of bilingual Indian silver types: diademed, wearing a helmet with bull's horns or a flat kausia.

This was interpreted by Tarn and other earlier scholars as though the two kings might have forged some kind of alliance, but later, a bronze with the opposite arrangement was found.

Modern scholarship has however largely accepted that what was originally supposed to be a "joint issue" was in fact a mule; in other words, a mistake occurred in the process of overstriking the original coin, and it was accidentally issued with both king's standards.