"We Must Have Been Out Of Our Minds" is a song made famous as a duet by country music singers George Jones and Melba Montgomery. Originally released in 1963, the song became a Top 5 hit on the Billboard Hot Country Singles chart and a country music standard.

Duets, featuring the voices of two top stars that usually perform as solo acts, have been a staple of country music since its beginnings, the pairings meeting with varying levels of success. The song "We Must Have Been Out Of Our Minds" paired, in the opinion of genre historian Bill Malone, "two top-flight, hard country singers." It also was "made distinctive by the interplay between the dobro and pedal steel guitar," and became "a modern classic of honky tonk music," continued Malone. In his autobiography I Lived To Tell It All, Jones remained quite proud of the work he did with Montgomery: "I had giant records years later with Tammy Wynette, and there were many other successful duet partners, such as Porter Wagoner and Dolly Parton and Conway Twitty and Loretta Lynn. I'm not saying Melba and I were the first to sing male-female duets in country music because we weren't. And I'm not saying we were the best. But Melba said recently that she thinks we popularized the male-female format, and I agree."

"We Must Have Been Out of Our Minds" was Montogmery's first national hit, and the most successful recording from the Jones-Montgomery duet pairing. The song reached No. 3 on the Billboard Hot Country Singles chart in July 1963, and spent 23 weeks in the chart's top 40, one of the longer runs of any country single released during the 1960s. Montgomery later remembered: "I was nervous as a cat! Not only was it my first major session, but it was with George Jones! George had been out roarin' the night before, and nobody even knew where he was until an hour before the session. When he finally showed up, he was in a really good mood, and the whole thing came off really well."

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