If You Mute Someone on Xbox Live, Can They Still Hear You?

No. Muting is a one-way audio block enforced server-side. When you mute a player:

• Their voice chat never reaches your headset.
• Your voice chat never reaches their headset.
• Text messages, party invites, and game invites from them are suppressed.

The muted player receives no notification—they won't see a "you've been muted" alert. From their perspective, you simply aren't speaking. They can still:

• See your gamertag in-game.
• Join your public match if matchmaking places them there.
• Send messages that you won't see (they go to a filtered folder).

Muting is per-session and per-profile. To block entirely (including future matchmaking), use Block from their profile → "Block" → "Submit." Blocking removes them from your friend list, prevents party joins, and hides your online status from them.

Communication control is entirely yours—silence who you want, when you want.