To see the posts someone else has liked on Instagram, there is no direct or automated way to view a complete list of their liked posts due to Instagram's privacy settings. However, you can try the following manual method:

• Go to the Instagram profile of the person whose liked posts you want to see.
• Tap on their Following list to view the accounts they follow.
• Visit those followed accounts and look at their posts.
• On each post, tap the likes to see the list of users who liked it.
• Search for the specific person's username in that list to check if they liked the post.

This method is time-consuming and only works for public accounts or accounts you follow, and you can only see likes on posts that are publicly accessible or visible to you

. If you want to see your own liked posts on Instagram, you can do so easily by following these steps:

1. Open the Instagram app.
2. Tap your profile picture in the bottom-right corner.
3. Tap the three-line menu (hamburger menu) in the upper-right corner.
4. Select Your Activity.
5. Tap Interactions.
6. Tap Likes.

Here, you will see up to the 300 most recent posts you have liked, including photos, videos, and reels. You can also filter and sort these liked posts by date, content type, and author. Additionally, you can unlike posts in bulk from this section if you wish

. In summary:

Viewing Liked Posts| How to Access
---|---
Your own liked posts| Profile > Menu > Your Activity > Interactions > Likes
Someone else's liked posts| Manually check posts liked by them on public or followed accounts by viewing likes on individual posts

There is no official or safe third-party app that can show someone else's liked posts in bulk due to Instagram's privacy policies

. This is the current way to see liked posts on Instagram respecting privacy and platform limitations.