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{{Infoboxemulator|first logo = UltraHLE.gif|logowidth = 270px|last-version = 1.0.0|second active = No|third fate = Discontinued due to legal threats and incessant user demand|platform = [[Emulators on Windows|Windows]]|architecture = x86|target = [[Nintendo 64 emulators|Nintendo 64]]|fourth developer = RealityMan and <br/>Epsilon|fifth website = [https://web.archive.org/web/20070313161158/http://www.emuunlim.com/UltraHLE/ Official siteArchive link]|sixth source = [https://storage.googleapis.com/google-code-archive-source/v2/code.google.com/p/ultrahle/source/browse/ UltraHLE Source -archive.zip Google Code 1.0.0(Archived)](leaked)

 '''UltraHLE''' was is a discontinued freeware [[Nintendo 64 Emulatorsemulators|Nintendo 64]] emulator which gained notoriety for being the first to run commercial games at full speed on the hardware of the time.

*{| cellpadding="4"|-|align=center|{{Icon|Win-big}}|'''[https://web.archive.org/web/20070312015944/http://www.emulator-zoneemuunlim.com/doc.phpUltraHLE/n64/ultrahledownloads.html Download page for shtml UltraHLE, along with some background info on the emuv1.0]'''<br/><small>Backup from archive.org</small>|}

The Nintendo 64 was just only about three years old at the time of UltraHLE's release, and while . While there were earlier projects aiming to emulate the console's inner workings, UltraHLE was the first to run games at a playable speed on a typical Pentium II/III system with a decent GPU. While In contrast to 8 and 16-bit emulators for earlier systems which concentrated on simulating operations at a lower level (although they too, like NESticle and ZSNES, resort to game-specific hacks and other shortcuts for games to be playable on modest hardware), co-authors Epsilon and RealityMan took a different approach through intercepting C calls and using libraries to respond to them. This also led to a strange situation, especially with later NES/SNES emulators, where in that wherein emulating the Nintendo 64 would at the very least call for the same, similar if not lower-end hardware, compared to emulating an early console in an accurate fashion.

As it was released at the time when the console was still on the market and considered profitable, Nintendo took offence and threatened the authors with legal action. This, along with pressure from userswho constantly pestered the developers for new features and such, has led to Epsilon and RealityMan discontinuing the emulator.