State Bank of India (SBI) topped the list of Public Sector Banks (PSB) writing off loans in FY21 Followed by Union Bank of India (UB).
Top 3 list of PSBs wrote off bad loans in FY21:

Note – As per the Reserve Bank of India (RBI) Report, the reduction in NPAs through write-off by PSBs in FY21 stood at Rs 1,31,894 crore from Rs 1,75,877 crore in FY20. The NPAs of banks in
FY21 declined by Rs 61,180 crore to Rs 8.34 lakh Crore.
About State Bank of India (SB):
Establishment 1st July 1955
Chairman – Dinesh Kumar Khara
Headquarters Mumbai, Maharashtra
Tagline The Banker to Every Indian