Not in survival mode, but in creative mode you can.
This applies to both Java and Bedrock
22 Answers
It is possible to obtain obsidian in survival Minecraft (Java edition and Bedrock edition) with a diamond or netherite pickaxe. The Efficiency enchantment is recommended as obsidian takes longer to break than most other blocks.
5yes but you need a diamond pickaxe a new one and a efficiency 111 picks