This article aimed to study demographic factors, relationship between attitudes and behaviors towards online financial services via smartphone s of Thai population in Bangkok , Thailand Metropolis and Vicinity during the Covid -19 situation. The study was conducted among 400 Thai people living in Bangkok, Thailand Metropolis and Vicinity. A questionnaire was used as the instrument. Statistics in the study included percentage, mean, standard deviation, and Pearson correlation coefficient. The findings from the study showed that most of the participants were female school/college students aged 18-25 years with an average monthly income of 5,000-10,000 baht and live in Bangkok. Most people k new how to use online financial services via smartphone through advertisement s on social media such as Facebook, Twitter or Tiktok. They used the service of Siam Commercial Bank (SCB EASY APP) the most, 1-3 times /day. The type of transaction they most likely used was money transfer from their accounts to accounts of others. The reason they used the service was that it was convenient, fast and trendy. With regard to data analysis about attitudes and behaviors towards online financial services via smartphone of Thai population in Bangkok Metropolis and Vicinity during the Covid-19 situation, it was found that most people had attitudes towards “confidence in the banking system” and most of them have behaviors towards online financial services via smartphone si nce it was convenient, fast and easy to use.