In entertainment:

• Snoop Dogg, a rapper, actor and music producer
• Felicia "Snoop" Pearson, a character in the television series The Wire
• Felicia Pearson, also nicknamed "Snoop", the actress who plays the above character of the same name
• Snoopy, famous character in the comic strip Peanuts

In technology:

• snoop (software), a utility to capture and inspect network packets, included with the Solaris operating system
• a snoop cycle in a microprocessor's cache coherency mechanism

It can also mean:

• a private detective
• a person who snoops
• a person who does pry where he or she has no business
• a person who sticks or pokes his or her nose where it doesn't belong