Yes, tipping a private tour guide is standard practice in most parts of the world, though the amount and expectation vary significantly by culture. In the United States and Canada, a tip of 10% to 20% of the total tour cost is customary for a private guide who provides a personalized, high-quality experience. In Europe, tipping is less "mandatory" but still highly appreciated; a tip of €20 to €50 for a full-day private tour is considered generous and appropriate. In many Asian and African countries, while not a traditional part of the local culture, tipping is now expected in the tourism sector, and a few dollars (or the local equivalent) per person is a kind gesture. It is important to remember that for private guides, the "tip" often makes up a significant portion of their take-home pay, as the base fee you pay the tour company often covers overhead and marketing. If the guide went "above and beyond"—such as helping you navigate a local market or providing deep historical insights—leaning toward the higher end of the scale is a great way to show your appreciation for their expertise and time.