Do DVDs Play on Wii? No

No. The Wii's drive reads:

• Wii Optical Discs (single/dual layer)
• GameCube Game Discs (miniDVD)

It cannot play standard DVD-Video, DVD-Audio, or data DVDs.

Workarounds (Historical)

• Homebrew (DVDx / MPlayer CE): Enabled DVD playback on hacked Wii (requires Homebrew Channel).
• WiiMC: Media player homebrew supporting DVD, USB, SMB, streaming.

Modern Advice

Use a $20 Blu-ray player, game console (PS3/4/5, Xbox One/Series), or smart TV app. The Wii's laser isn't optimized for DVD-Video and wears faster.