Trials HD is an Xbox Live Arcade game developed by RedLynx and published by Microsoft Game Studios. It was released on August 12, 2009 as part of the second annual Xbox Live Summer of Arcade and was later re-released in a retail pack alongside Limbo and 'Splosion Man in April 2011. It is a 2.5D puzzle/racing game. The player must guide a trial motorcycle with exaggerated physics through various obstacles to reach each stage's finish line.

The game was well received by critics, averaging 86.1% at GameRankings and 86/100 at Metacritic, two video game aggregate sites. In 2009 it received the Best Overall Arcade Game and Best Innovation awards, voted on by the Xbox 360 community. In September 2010 IGN listed Trials HD sixteenth in their top twenty-five Xbox Live Arcade titles of all time. The game was a commercial success, and sales have exceeded two million units with collective downloadable content sales factored in.

In Trials HD the player controls a rider on a physics-based motorcycle from the start of the level to the end while navigating a number of obstacles. The objective is to complete the course as fast as possible and with as few crashes, known in the game as faults, as possible. The game uses 3D graphics, but is played on a 2D plane, so the rider can only move forwards and backwards. Players can also control the bike's pitch at slow speeds or while in the air.

A trial is, in the most general sense, a test, usually a test to see whether something does or does not meet a given standard.

It may refer to: