Here is the list of Catholic Churches in Bangkok where you can celebrate and attend Christmas and New Year masses.
Holy Redeemer Church Bangkok
123/15 Ruamrudee Soi 5
Wittayu Road Patumwan
Bangkok Thailand 10330
Saint Thomas Aquinas Catholic Church
6 Soi Ramkamhaeng 184, Ramkamhaeng Road,
Minburi, Bangkok, Thailand 10510
Maria Rosa Mystica Church
3 Lat Phrao 124 Alley, Phlabphla,
Wang Thonglang, Bangkok 10310
Misang Tagalog sa Bangkok at Mary Help of Christians
32 Krungthep Kritha Road, Hua Mark
Bangkok, BM 10240 Thailand