There are 10 aliens that can be collected, and they are collected through space exploration on a rocket ship or digging into alien craters in Get to Work. Sims with the Appraiser aspiration reward trait can sell collectibles such as metals, crystals, elements, and fossils to the Simsonian Museum for extra money.

Players can track the number of collectibles the household has collected by the usage of the Household Collections, that can be found from the upper right corner of a Sims inventory, indicated by a diamond.

The Curator aspiration is heavily focused on collecting, with milestones requirements having things such as collecting crystals, frogs and fossils. Frogs can be collected by searching from fishing spots, that can be found in Magnolia Blossom Park and Desert Bloom Park, or from moss-covered logs. There are various rocks scattered around neighborhoods, that Sims can dig in order to gain metals, crystals, MySims trophies, and fossils. Collecting is not a skill that Sims can develop. There are currently 16 collections in the base game and 15 additional collections from content packs. The Sims 4 has revamped item collection from The Sims 3, making it a larger aspect of the game, and linking various aspirations to it. Not to be confused with Collecting (The Sims 3).

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