"Show Don't Tell" is the first single by the progressive Canadian rock band Rush from their 1989 album Presto. The song peaked at number 1 on the U.S. Hot Mainstream Rock Tracks Chart, the second of five songs by Rush to top the chart.

"Show Don't Tell" illustrates Rush's move away from synthesizer in favour of a more guitar-oriented approach; the band favoured a more funk/groove style of play and away from the 1980s style of music typical in the two preceding albums Power Windows and Hold Your Fire. In Rush's music of the late 1970s and early 1980s, their progressive rock is indicated by asymmetric time signatures and lyrics fitting into a concept album, and in "Show Don't Tell", their progressive rock is shown by using a very complex riff played in unison by the members of the band. The band chose to use more funk by using extended chord tones, a dramatic pause eighteen seconds into the song and other methods as well.

The funkier song structure proved to be difficult for Neil Peart when he played the drums for the song. He explained in Canadian Musician,
" 'Show Don't Tell' begins with a syncopated guitar riff that appears two or three times throughout the song. That was about the hardest thing for me to find the right pattern for. I wanted to maintain a groove and yet follow the bizarre syncopations that the guitar riff was leading into. It was demanding technically, but at the same time, because of that, we were determined that it should have a rhythmic groove under it. It's not enough for us to produce a part that's technically demanding; it has to have an overwhelming significance musically. So it had to groove into the rest of the song and it had to have a pulse to it that was apart from what we were playing."

As is the case with a vast majority of Rush songs, Neil Peart writes the lyrics for this song. In an interview, he explained that "Show Don't Tell" is an example of his trend from the album Grace Under Pressure onward from writing concepts and abstractions to a more concrete, first-person viewpoint, or as he noted when interviewed a perspective with a "stance and a good attitude". Peart alternates between narration and a first person perspective as he writes about confronting a person who has fooled the protagonist of the song too often. Peart's philosophy throughout the song is epitomized with the very no-nonsense lyric "You can twist perception. Reality won't budge!" The first verse explains the frustration of depending on others and finding out that is the wrong approach (e.g. "Everyone knows everything, and no one's ever wrong, until later. Who can you believe?").

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