Yes. The IRS treats Canada Pension Plan (CPP) or Old Age Security (OAS) benefits as Social Security equivalents for US taxes.
You will still need to file Form 1116 to claim a credit in USD for any Canadian income tax withheld. You cannot add that as US tax withheld in the Social Security section,
Notice 98-23 said:
Under the new rules (that is, the 1997 Protocol), Canadian social security benefits paid to U.S. residents generally will be taxable, if at all, only by the United States. The benefits will be taxed at graduated rates on a net basis as if they were benefits paid under the U.S. Social Security Act.
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