The best replacement for triple sec is cointreau.

The best alternatives to triple sec are rated as following:
★★★★★  cointreau
★★★★★  grand marnier
★★  orange liqueur
★★  blue curacao
★  curacao
★  orange curacao
★  sweet and sour
★  simple syrup
★  cointreau cosmopolitan
  grand marnier margarita
  schnapps
  gran gala
  vermouth
  grenadine
  orange liquor
  margarita mix
  orange bitters
  peach schnapps

Your alternative for triple sec is not listed? Suggest!
Speaking about triple sec, one probably shouldn't forget about tequila.

Other search terms related to triple sec and their ratings are:
★★★★★ tequila
★★★★ margarita mix
★ tequila recipes
You have in mind a companion for triple sec and it is not yet here? Propose!



Google Trends

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triple sec
cointreau
grand marnier